Bump app-model from 0.3.2 to 0.5.1

Bumps [app-model](https://github.com/pyapp-kit/app-model) from 0.3.2 to 0.5.1.
- [Release notes](https://github.com/pyapp-kit/app-model/releases)
- [Changelog](https://github.com/pyapp-kit/app-model/blob/main/CHANGELOG.md)
- [Commits](pyapp-kit/app-model@v0.3.2...v0.5.1)

---
updated-dependencies:
- dependency-name: app-model
  dependency-version: 0.5.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements/REQUIREMENTS-NAPARI-CI.txt

@@ -1,7 +1,7 @@
 # You should not edit this file directly.  Instead, you should edit one of the following files (requirements/REQUIREMENTS-NAPARI-CI.txt.in) and run make requirements/REQUIREMENTS-NAPARI-CI.txt
 alabaster==0.7.16
 annotated-types==0.7.0
-app-model==0.3.2
+app-model==0.5.1
 appdirs==1.4.4
 asciitree==0.3.3
 asttokens==3.0.1