Make readability-function-cognitive-complexity threshold more strict … #2176

Job	Run time
python-lint	6s
clang-format	9s
ubuntu-clang-build	4m 59s
ubuntu-gcc-build	1m 38s
windows-msvc-build	4m 14s
macos-clang-build	3m 5s
windows-clang-build	5m 25s
ubuntu-gcc-test	7m 56s
macos-clang-test	2m 54s
windows-msvc-test	2m 33s
ubuntu-clang-test	7m 5s
ubuntu-clang-sanitizer-build	3m 44s
windows-clang-test	1m 28s
macos-clang-test-extended	2m 48s
windows-clang-test-extended	2m 29s
windows-msvc-test-extended	2m 20s
ubuntu-gcc-test-extended	4m 40s
ubuntu-clang-sanitizer-test	4m 16s
ubuntu-clang-test-extended	4m 55s
ubuntu-clang-sanitizer-test-extended	9m 10s
ubuntu-gcc-build-codecov	7m 7s
ubuntu-gcc-build-perf-stats	2m 10s
	1h 25m 11s

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