CI: Strict channel Priority
- [ ] closes #xxxx
- [ ] tests added / passed
- [ ] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit) for how to run them
- [ ] whatsnew entry

Hopefully, this makes the slow Database CI that takes 6+ hours go faster(most of the time is in the resolve environments step). Also turns on the database builds for commits to 1.3.x which was left out due to an oversight.

Unfortunately, this doesn't work for posix since the env doesn't resolve with strict channel priority.