Release ink! 3.0.0-rc8

[cmichi]

Please do not merge! I'll do it myself after I've published the crates.

Preview here

[codecov-commenter]

Codecov Report

Merging #1105 (0171829) into master (ba7e8ed) will increase coverage by 16.33%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #1105       +/-   ##
===========================================
+ Coverage   62.51%   78.84%   +16.33%     
===========================================
  Files         252      252               
  Lines        9395     9397        +2     
===========================================
+ Hits         5873     7409     +1536     
+ Misses       3522     1988     -1534     

Impacted Files	Coverage Δ
crates/allocator/src/bump.rs	62.50% <0.00%> (-4.17%)	⬇️
crates/storage/src/traits/impls/prims.rs	96.92% <0.00%> (+1.53%)	⬆️
crates/lang/ir/src/ir/attrs.rs	82.27% <0.00%> (+3.60%)	⬆️
...ates/storage/src/collections/hashmap/fuzz_tests.rs	100.00% <0.00%> (+4.25%)	⬆️
crates/env/src/api.rs	36.36% <0.00%> (+4.54%)	⬆️
crates/metadata/src/layout/mod.rs	77.01% <0.00%> (+4.59%)	⬆️
crates/lang/ir/src/ir/trait_def/item/mod.rs	90.16% <0.00%> (+4.91%)	⬆️
crates/lang/ir/src/ir/item_impl/constructor.rs	93.84% <0.00%> (+6.15%)	⬆️
crates/env/src/engine/off_chain/test_api.rs	80.85% <0.00%> (+6.38%)	⬆️
crates/engine/src/ext.rs	72.41% <0.00%> (+6.89%)	⬆️
... and 56 more

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