Bump version to 2.63.0-dev #4268

Job	Run time
Run release tests	19s
Prepare supported CodeQL environment matrix	7s
Run Guideline Recategorization tests	18s
Run analysis report tests (2.21.4, codeql-cli/v2.21.4, codeql-bundle-v2.21.4)	7m 9s
	7m 53s

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