docs(release): new minor release process

[phisco]

Description of your changes

Used to create release-1.13 branch while working on #386 I have:

• [x] Read and followed Upbound's contribution process.
• [ ] ~Run make reviewable to ensure this PR is ready for review.~
• [ ] ~Added backport release-x.y labels to auto-backport this PR, as appropriate.~

How has this code been tested