Ruby

ci: declare workflow-level `contents: read` on 6 test/lint workflows #8131

Job	Run time
C99_compile (4.0)	57s
C99_compile (head)	53s
clang_compile (head)	1m 16s
clang_compile (4.0)	1m 16s
test (head, test)	2m 14s
test (head, stdlib_test rubocop)	1m 53s
test (3.3, test)	2m 42s
test (3.2, test)	2m 15s
test (4.0, stdlib_test)	2m 1s
test (asan-release, test)	8m 10s
test (4.0, typecheck_test)	1m 32s
test (4.0, test, --enable-frozen-string-literal)	2m 23s
test (4.0, rubocop validate test_doc build test_generate_stdlib raap)	2m 30s
test (4.0, test)	2m 26s
test (4.0, stdlib_test, --enable-frozen-string-literal)	1m 52s
test (3.4, test)	2m 28s
	36m 48s

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