Bump wagtailmedia from 0.14.5 to 0.15.1

Bumps [wagtailmedia](https://github.com/torchbox/wagtailmedia) from 0.14.5 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@v0.14.5...v0.15.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -286,7 +286,7 @@ wagtail-localize-git==0.14.1
     # via -r requirements.in
 wagtail-metadata==5.0.0
     # via -r requirements.in
-wagtailmedia==0.14.5
+wagtailmedia==0.15.1
     # via -r requirements.in
 webencodings==0.5.1
     # via html5lib