This changes the postgrest-release tool to work with our new workflow.
It can be run on main and the v* release branches. When on a release
branch, it will bump a patch version and push to that branch only.
When on main, it will bump a minor version by default. To bump a major
version, pass --major. This first bump will be force-pushed to the
v<major> branch. A second bump to the current development version will
then be pushed to the main branch.
The tool will not tag commits anymore - this happens in CI
automatically.
References #3113Resolves#3082
