Pin bazel version to version 6 in MacOS #4084

Job	Run time
VerifyFormatting	1m 41s
ClangTidy	1h 27m 55s
x86_64 test	13m 13s
arm64 test	4m 51s
MacOsBuild	26s
KytheXrefs	0s
x86_64 test-nortti	13m 1s
x86_64 test-c++20	16m 24s
KytheVerification	22s
MacOsBuildDevTools	1m 52s
x86_64 test-c++23	16m 46s
Generate Build matrix	3s
x86_64 smoke-test	15m 9s
PrepareVSPlugin	2m 0s
arm64 smoke-test	15m 38s
WindowsBuild	12m 59s
x86_64 smoke-test-analyzer	18m 8s
arm64 smoke-test-analyzer	17m 13s
x86_64 asan	21m 18s
x86_64 asan-clang	17m 9s
x86_64 compile	3m 5s
arm64 compile	3m 56s
x86_64 compile-clang	2m 45s
arm64 compile-clang	4m 4s
x86_64 compile-static	2m 56s
arm64 compile-static	3m 48s
x86_64 compile-static-clang	3m 16s
arm64 compile-static-clang	3m 49s
x86_64 coverage	17m 51s
x86_64 clean	7m 41s
arm64 clean	6m 58s
Build ·${{ matrix.arch }}:${{ matrix.os }}:${{ matrix.ver }}${{ (((matrix.link == 'static') && ':static') \|\| '') }}	0s
Build and deploy GitHub pages	0s
📦 Release	0s
	5h 36m 17s

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