Add net8.0 target for tests/benchmarks, remove obsolete, update packages

[lahma]

And results for earlier net6.0 benchmarks setup against new net8.0.

BenchmarkDotNet v0.13.10, Windows 11 (10.0.23595.1001)
AMD Ryzen 9 5950X, 1 CPU, 32 logical and 16 physical cores
.NET SDK 8.0.100
  [Host]     : .NET 6.0.25 (6.0.2523.51912), X64 RyuJIT AVX2
  Job-GSHXLU : .NET 6.0.25 (6.0.2523.51912), X64 RyuJIT AVX2
  Job-OINLIE : .NET 8.0.0 (8.0.23.53103), X64 RyuJIT AVX2

Method	Runtime	Mean	Error	StdDev	Ratio	RatioSD	Gen0	Gen1	Gen2	Allocated	Alloc Ratio
CreateCompiledSmallParser	.NET 6.0	66,064.471 ns	613.3239 ns	543.6956 ns	1.00	0.00	1.8311	0.8545	-	32128 B	1.00
CreateCompiledSmallParser	.NET 8.0	46,698.962 ns	218.9613 ns	194.1035 ns	0.71	0.01	1.9531	1.7090	-	33289 B	1.04
CreateCompiledExpressionParser	.NET 6.0	11,568.647 ns	59.3786 ns	52.6376 ns	1.00	0.00	0.2747	0.1373	0.0153	4847 B	1.00
CreateCompiledExpressionParser	.NET 8.0	8,120.875 ns	53.3972 ns	47.3352 ns	0.70	0.00	0.2747	0.2441	-	5022 B	1.04
CursorMatchHello	.NET 6.0	36.447 ns	0.2416 ns	0.2018 ns	1.00	0.00	0.0076	-	-	128 B	1.00
CursorMatchHello	.NET 8.0	28.387 ns	0.3950 ns	0.3695 ns	0.78	0.01	0.0076	-	-	128 B	1.00
CursorMatchGoodbye	.NET 6.0	38.540 ns	0.8188 ns	0.9101 ns	1.00	0.00	0.0076	-	-	128 B	1.00
CursorMatchGoodbye	.NET 8.0	28.757 ns	0.1282 ns	0.1137 ns	0.75	0.02	0.0076	-	-	128 B	1.00
CursorMatchNone	.NET 6.0	30.644 ns	0.1063 ns	0.0888 ns	1.00	0.00	0.0076	-	-	128 B	1.00
CursorMatchNone	.NET 8.0	23.386 ns	0.2306 ns	0.2157 ns	0.76	0.01	0.0076	-	-	128 B	1.00
DecodeStringWithoutEscapes	.NET 6.0	8.829 ns	0.1254 ns	0.1173 ns	1.00	0.00	-	-	-	-	NA
DecodeStringWithoutEscapes	.NET 8.0	13.713 ns	0.0329 ns	0.0307 ns	1.55	0.02	-	-	-	-	NA
DecodeStringWithEscapes	.NET 6.0	63.227 ns	0.1997 ns	0.1559 ns	1.00	0.00	0.0072	-	-	120 B	1.00
DecodeStringWithEscapes	.NET 8.0	54.421 ns	0.9898 ns	0.7728 ns	0.86	0.01	0.0072	-	-	120 B	1.00
ExpressionRawBig	.NET 6.0	1,290.535 ns	18.0353 ns	16.8703 ns	1.00	0.00	0.0706	-	-	1200 B	1.00
ExpressionRawBig	.NET 8.0	1,176.778 ns	3.0264 ns	2.8309 ns	0.91	0.01	0.0706	-	-	1200 B	1.00
ExpressionCompiledBig	.NET 6.0	2,676.705 ns	4.9175 ns	4.3592 ns	1.00	0.00	0.1717	-	-	2888 B	1.00
ExpressionCompiledBig	.NET 8.0	2,257.064 ns	12.9159 ns	11.4496 ns	0.84	0.00	0.1717	-	-	2888 B	1.00
ExpressionFluentBig	.NET 6.0	3,572.775 ns	25.1562 ns	23.5311 ns	1.00	0.00	0.1717	-	-	2888 B	1.00
ExpressionFluentBig	.NET 8.0	2,885.471 ns	13.6091 ns	12.0641 ns	0.81	0.01	0.1717	-	-	2888 B	1.00
ExpressionRawSmall	.NET 6.0	268.375 ns	1.6459 ns	1.5396 ns	1.00	0.00	0.0181	-	-	304 B	1.00
ExpressionRawSmall	.NET 8.0	244.334 ns	1.5613 ns	1.4604 ns	0.91	0.01	0.0181	-	-	304 B	1.00
ExpressionCompiledSmall	.NET 6.0	465.102 ns	2.5673 ns	2.4014 ns	1.00	0.00	0.0391	-	-	656 B	1.00
ExpressionCompiledSmall	.NET 8.0	426.028 ns	1.8747 ns	1.6619 ns	0.92	0.00	0.0391	-	-	656 B	1.00
ExpressionFluentSmall	.NET 6.0	681.676 ns	1.8384 ns	1.7196 ns	1.00	0.00	0.0391	-	-	656 B	1.00
ExpressionFluentSmall	.NET 8.0	554.659 ns	1.5836 ns	1.4038 ns	0.81	0.00	0.0391	-	-	656 B	1.00
BigJson	.NET 6.0	109,022.250 ns	510.9494 ns	398.9157 ns	1.00	0.00	5.9814	0.9766	-	101672 B	1.00
BigJson	.NET 8.0	77,735.426 ns	588.3469 ns	550.3401 ns	0.71	0.01	5.6152	1.0986	-	93992 B	0.92
BigJsonCompiled	.NET 6.0	91,802.176 ns	571.1060 ns	534.2129 ns	1.00	0.00	5.9814	1.3428	-	101672 B	1.00
BigJsonCompiled	.NET 8.0	66,770.095 ns	501.5959 ns	444.6517 ns	0.73	0.01	5.6152	1.2207	-	93992 B	0.92
DeepJson	.NET 6.0	77,054.780 ns	341.6904 ns	319.6174 ns	1.00	0.00	6.7139	0.6104	-	112976 B	1.00
DeepJson	.NET 8.0	51,874.220 ns	469.9253 ns	439.5685 ns	0.67	0.01	5.9814	0.6714	-	100688 B	0.89
DeepJsonCompiled	.NET 6.0	49,498.904 ns	387.1771 ns	343.2224 ns	1.00	0.00	6.7139	1.4648	-	112976 B	1.00
DeepJsonCompiled	.NET 8.0	42,776.002 ns	210.9673 ns	197.3390 ns	0.86	0.01	5.9814	1.4038	-	100688 B	0.89
LongJson	.NET 6.0	92,829.261 ns	349.2154 ns	309.5704 ns	1.00	0.00	8.0566	1.7090	-	135512 B	1.00
LongJson	.NET 8.0	65,201.939 ns	276.9507 ns	245.5096 ns	0.70	0.00	7.3242	1.7090	-	123224 B	0.91
LongJsonCompiled	.NET 6.0	78,474.431 ns	536.9552 ns	502.2683 ns	1.00	0.00	8.0566	1.7090	-	135512 B	1.00
LongJsonCompiled	.NET 8.0	61,426.626 ns	293.8466 ns	260.4874 ns	0.78	0.01	7.3242	1.7090	-	123224 B	0.91
WideJson	.NET 6.0	50,205.221 ns	251.6121 ns	235.3581 ns	1.00	0.00	2.4414	0.1831	-	41584 B	1.00
WideJson	.NET 8.0	34,258.952 ns	126.9208 ns	112.5119 ns	0.68	0.00	2.4414	0.2441	-	41536 B	1.00
WideJsonCompiled	.NET 6.0	42,753.030 ns	228.5757 ns	213.8098 ns	1.00	0.00	2.4414	0.2441	-	41584 B	1.00
WideJsonCompiled	.NET 8.0	31,410.832 ns	148.0368 ns	131.2307 ns	0.73	0.00	2.4414	0.2441	-	41536 B	1.00
Lookup	.NET 6.0	36.338 ns	0.1361 ns	0.1207 ns	1.00	0.00	0.0076	-	-	128 B	1.00
Lookup	.NET 8.0	29.935 ns	0.2509 ns	0.2224 ns	0.82	0.01	0.0076	-	-	128 B	1.00
SkipWhiteSpace_1	.NET 6.0	27.034 ns	0.1110 ns	0.1038 ns	1.00	0.00	0.0076	-	-	128 B	1.00
SkipWhiteSpace_1	.NET 8.0	22.322 ns	0.1929 ns	0.1805 ns	0.83	0.01	0.0076	-	-	128 B	1.00
SkipWhiteSpace_10	.NET 6.0	37.482 ns	0.1700 ns	0.1507 ns	1.00	0.00	0.0076	-	-	128 B	1.00
SkipWhiteSpace_10	.NET 8.0	30.714 ns	0.1662 ns	0.1474 ns	0.82	0.01	0.0076	-	-	128 B	1.00

[lahma]

Everything seems like ~20-30% faster than before, the DecodeStringWithoutEscapes seems odd now that it has regressed quite a bit.