Bump wagtailmedia from 0.14.4 to 0.15.1

Bumps [wagtailmedia](https://github.com/torchbox/wagtailmedia) from 0.14.4 to 0.15.1.
- [Release notes](https://github.com/torchbox/wagtailmedia/releases)
- [Changelog](https://github.com/torchbox/wagtailmedia/blob/main/CHANGELOG.md)
- [Commits](torchbox/wagtailmedia@v0.14.4...v0.15.1)

---
updated-dependencies:
- dependency-name: wagtailmedia
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

pyproject.toml

@@ -21,7 +21,7 @@ python = "^3.11"
 sentry-sdk = "^1"
 slippers = "^0.6.0"
 wagtail = "~5.0"
-wagtailmedia = "^0.14.4"
+wagtailmedia = "^0.15.1"
 wagtail-markdown = "^0.11"
 wagtail-factories = "^4.1.0"
 wagtail-storages = "^1.0.0"