Merge pull request #791 from github/michaelrfairhurst/concurrency6-pa… #3373

Job	Run time
Prepare CodeQL unit test matrix	12s
Run unit tests (cpp, 2.18.4, codeql-cli/v2.18.4, codeql-bundle-v2.18.4, ubuntu-latest-xl, codeql-...	1h 23m 23s
Run unit tests (c, 2.18.4, codeql-cli/v2.18.4, codeql-bundle-v2.18.4, ubuntu-latest-xl, codeql-cl...	32m 48s
Validate test results	4s
	1h 56m 27s

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