Use official Apt respositories for LLVM CI #12585

Job	Run time
check_format	1m 38s
check_format	1m 38s
x86_64-gnu-test (1.7.3)	9m 10s
x86_64-gnu-test (1.7.3)	35m 54s
x86_64-gnu-test-preview_mt	5m 33s
x86_64-gnu-test-preview_mt	5m 33s
x86_64-gnu-test (1.8.2)	4m 42s
x86_64-gnu-test (1.8.2)	33m 58s
x86_64-gnu-test (1.9.2)	3m 31s
x86_64-gnu-test (1.9.2)	34m 20s
x86_64-musl-test	42m 15s
x86_64-musl-test	42m 15s
x86_64-gnu-test (1.10.1)	20m 9s
x86_64-gnu-test (1.10.1)	34m 22s
x86_64-gnu-test (1.11.2)	19m 13s
x86_64-gnu-test (1.11.2)	33m 1s
x86_64-gnu-test (1.12.2)	19m 20s
x86_64-gnu-test (1.12.2)	34m 59s
x86_64-gnu-test (1.13.3)	18m 56s
x86_64-gnu-test (1.13.3)	35m 10s
x86_64-gnu-test (1.14.0)	18m 43s
x86_64-gnu-test (1.14.0)	33m 44s
x86_64-gnu-test (1.0.0, FLAGS=-Dwithout_ffi USE_PCRE1=true)	20m 50s
x86_64-gnu-test (1.0.0, FLAGS=-Dwithout_ffi USE_PCRE1=true)	33m 34s
x86_64-gnu-test (1.1.1, FLAGS=-Dwithout_ffi USE_PCRE1=true)	21m 10s
x86_64-gnu-test (1.1.1, FLAGS=-Dwithout_ffi USE_PCRE1=true)	34m 25s
x86_64-gnu-test (1.2.2, USE_PCRE1=true)	17m 9s
x86_64-gnu-test (1.2.2, USE_PCRE1=true)	35m 15s
x86_64-gnu-test (1.3.2, USE_PCRE1=true)	12m 6s
x86_64-gnu-test (1.3.2, USE_PCRE1=true)	36m 13s
x86_64-gnu-test (1.4.1, USE_PCRE1=true)	12m 6s
x86_64-gnu-test (1.4.1, USE_PCRE1=true)	35m 13s
x86_64-gnu-test (1.5.1, USE_PCRE1=true)	11m 2s
x86_64-gnu-test (1.5.1, USE_PCRE1=true)	32m 53s
x86_64-gnu-test (1.6.2, USE_PCRE1=true)	10m 43s
x86_64-gnu-test (1.6.2, USE_PCRE1=true)	34m 15s
	13h 54m 58s

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