Make readability-function-cognitive-complexity threshold more strict #2174

Job	Run time
python-lint	6s
clang-format	10s
macos-clang-build	2m 31s
ubuntu-gcc-build	1m 49s
windows-msvc-build	4m 7s
windows-clang-build	5m 3s
ubuntu-clang-build	1m 50s
ubuntu-gcc-test	4m 24s
macos-clang-test	2m 53s
ubuntu-clang-test	5m 38s
ubuntu-clang-sanitizer-build	2m 4s
windows-msvc-test	2m 31s
macos-clang-test-extended	3m 1s
windows-clang-test	1m 19s
ubuntu-gcc-test-extended	4m 35s
ubuntu-clang-sanitizer-test	2m 13s
windows-clang-test-extended	2m 15s
windows-msvc-test-extended	2m 12s
ubuntu-clang-sanitizer-test-extended	2m 45s
ubuntu-clang-test-extended	4m 49s
ubuntu-gcc-build-codecov	6m 31s
ubuntu-gcc-build-perf-stats	1m 11s
	1h 3m 57s

Provide feedback