Upgrade `github/codeql` dependency to 2.18.4 #3249

Job	Run time
Prepare CodeQL unit test matrix	9s
Run unit tests (cpp, 2.18.4, codeql-cli/v2.18.4, codeql-bundle-v2.18.4, ubuntu-latest-xl, codeql-...	1h 32m 10s
Run unit tests (c, 2.18.4, codeql-cli/v2.18.4, codeql-bundle-v2.18.4, ubuntu-latest-xl, codeql-cl...	31m 55s
Validate test results	6s
	2h 4m 20s

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