Pin bazel version to version 6 in MacOS #4085

Job	Run time
VerifyFormatting	1m 47s
ClangTidy	1h 24m 25s
KytheVerification	5s
KytheXrefs	0s
x86_64 test	3m 25s
MacOsBuild	36s
arm64 test	4m 40s
MacOsBuildDevTools	15m 17s
Generate Build matrix	2s
x86_64 test-nortti	3m 34s
PrepareVSPlugin	2m 22s
x86_64 test-c++20	14m 31s
WindowsBuild	13m 20s
x86_64 test-c++23	15m 37s
x86_64 smoke-test	13m 24s
arm64 smoke-test	14m 23s
x86_64 smoke-test-analyzer	17m 53s
arm64 smoke-test-analyzer	17m 32s
x86_64 asan	21m 43s
x86_64 asan-clang	16m 54s
x86_64 compile	3m 3s
arm64 compile	3m 49s
x86_64 compile-clang	2m 48s
arm64 compile-clang	3m 47s
x86_64 compile-static	2m 40s
arm64 compile-static	3m 48s
x86_64 compile-static-clang	2m 56s
arm64 compile-static-clang	3m 48s
x86_64 coverage	17m 48s
x86_64 clean	6m 40s
arm64 clean	6m 54s
Build ·${{ matrix.arch }}:${{ matrix.os }}:${{ matrix.ver }}${{ (((matrix.link == 'static') && ':static') \|\| '') }}	0s
Build and deploy GitHub pages	0s
📦 Release	0s
	5h 19m 31s

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