Bump yt-dlp[default] from 2025.6.30 to 2025.7.21

Bumps [yt-dlp[default]](https://github.com/yt-dlp/yt-dlp) from 2025.6.30 to 2025.7.21.
- [Release notes](https://github.com/yt-dlp/yt-dlp/releases)
- [Changelog](https://github.com/yt-dlp/yt-dlp/blob/master/Changelog.md)
- [Commits](yt-dlp/yt-dlp@2025.06.30...2025.07.21)

---
updated-dependencies:
- dependency-name: yt-dlp[default]
  dependency-version: 2025.7.21
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

pyproject.toml

@@ -15,7 +15,7 @@ classifiers = [
     "Programming Language :: Python :: 3.11",
 ]
 dependencies = [
-    "yt-dlp[default]==2025.6.30",
+    "yt-dlp[default]==2025.7.21",
     "colorama~=0.4",
     "mergedeep~=1.3",
     "mediafile~=0.12",