Release

For both 2.1.x and main:

• Check that GH milestone for release don't have open issues
• Check if automation issues for GH Release is done
• Pick Release GA workflow, choose correct branch and execute it manually
• It's automated but stops for manual verification before promoting from staging to release and before pushing to central
• Pump version by running Next Dev Version workflow
• Create new GH Milestone
• Publish GH Release
• Change versions in spring.io
• Blog