Release: plotnine-0.13.1

[x] Upgrade key dependencies if necessary
- [x] mizani
- [x] matplotlib
- [x] pandas
- [x] numpy
- [x] scipy
- [x] statsmodels

[x] Upgrade code quality checkers

[x] pre-commit

pre-commit autoupdate

[x] ruff

pip install --upgrade ruff

[x] pyright

pip install --upgrade pyright
PYRIGHT_VERSION=$(pyright --version | grep -oE '[0-9]+\.[0-9]+\.[0-9]+')
python -c "
import pathlib, re
f = pathlib.Path('pyproject.toml')
f.write_text(re.sub(r'pyright==[0-9]+\.[0-9]+\.[0-9]+', 'pyright==$PYRIGHT_VERSION', f.read_text()))
"

[x] Run tests and coverage locally
```
git switch main
git pull origin/main
make typecheck
make test
make coverage
```
- [x] The tests pass
- [x] The coverage is acceptable
[x] The latest online documentation builds, be sure to browse
[x] Create a release branch
```
git switch -c release-v0.13.1
```
[x] Tag a pre-release version. These are automatically deployed on testpypi
```
git tag -as v0.13.1a1 -m "Version 0.13.1a1"  # e.g. 0.13.1a1, 0.13.1b1, 0.13.1rc1
git push -u origin release-v0.13.1
```
- [x] GHA release job passes
- [x] Plotnine test release is on TestPyPi
[x] Update changelog
```
nvim doc/changelog.qmd
git commit -am "Update changelog for release"
git push
```
- [x] Update / confirm the version to be released
- [x] Add a release date
- [x] The GHA tests pass
[x] Tag final version and release
```
git tag -as v0.13.1 -m "Version 0.13.1"
git push
```
- [x] The GHA Release job passes
- [x] PyPi shows the new release

[x] Update main branch

git switch main
git merge --ff-only release-v0.13.1
git push

[x] Create conda release
- [x] Copy SHA256 hash. Click view hashes, for the Source Distribution (.tar.gz).
- [x] Update plotnine-feedsock
```
cd ../plotnine-feestock
git switch main
git pull upstream main
git switch -c v0.13.1
nvim recipe/meta.yml
git commit -am  "Version 0.13.1"
git push -u origin v0.13.1
```
- [x] Create a PR
- [x] Complete PR (follow the steps and merge)
[x] Add zenodo badge to the changelog.

has2k1 / plotnine

Release: plotnine-0.13.1 #754