⬆️ Bump streamlink from 3.2.0 to 5.2.1 in /tvheadend (#193)

Bumps [streamlink](https://github.com/streamlink/streamlink) from 3.2.0 to 5.2.1.
- [Release notes](https://github.com/streamlink/streamlink/releases)
- [Changelog](https://github.com/streamlink/streamlink/blob/master/CHANGELOG.md)
- [Commits](streamlink/streamlink@3.2.0...5.2.1)

---
updated-dependencies:
- dependency-name: streamlink
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

tvheadend/requirements.txt

@@ -1,2 +1,2 @@
 setuptools==61.3.1
-streamlink==3.2.0
+streamlink==5.2.1