Bump pyxel from 1.9.13 to 1.9.14

Bumps [pyxel](https://github.com/kitao/pyxel) from 1.9.13 to 1.9.14.
- [Release notes](https://github.com/kitao/pyxel/releases)
- [Changelog](https://github.com/kitao/pyxel/blob/main/CHANGELOG.md)
- [Commits](kitao/pyxel@v1.9.13...v1.9.14)

---
updated-dependencies:
- dependency-name: pyxel
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -1,4 +1,4 @@
 # Keep the dependencies pinned, so we
 # can control breaking changes.
 
-pyxel==1.9.13
+pyxel==1.9.14