Revert version bump for temporary release work #3962

Job	Run time
Prepare CodeQL unit test matrix	5s
Run unit tests (c, 2.20.7, codeql-cli/v2.20.7, codeql-bundle-v2.20.7, ubuntu-latest-xl, codeql-cl...	35m 38s
Run unit tests (cpp, 2.20.7, codeql-cli/v2.20.7, codeql-bundle-v2.20.7, ubuntu-latest-xl, codeql-...	1h 41m 4s
Validate test results	7s
	2h 16m 54s

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