checkpointmysql==2.0.3

Changes since checkpointmysql==2.0.2

• Merge pull request #16 from tjni/vb/fix-attestations
• ci: turn off release attestations
• Release 2.0.3.
• Add tests to catch colon in channel name regression.
• Add tests to catch this regression.
• Refactor base64 decoding null check.
• Merge pull request #12 from asanger/as-fix-json-extract
• fix(query): Fixes json_extract query when path has ':' in key. #9
• fix(blobs): Fixes error when channel_values contain a null. #10
• Order pending sends returned by task ID.