Bump av from 8.0.3 to 8.1.0

Bumps [av](https://github.com/PyAV-Org/PyAV) from 8.0.3 to 8.1.0.
- [Release notes](https://github.com/PyAV-Org/PyAV/releases)
- [Changelog](https://github.com/PyAV-Org/PyAV/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/PyAV-Org/PyAV/compare/v8.0.3...v8.1.0)

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

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

requirements.txt

@@ -1,5 +1,5 @@
 aiortc==1.2.1
-av==8.0.3
+av==8.1.0
 matplotlib==3.5.1
 numpy==1.21.4
 opencv-python-headless==4.5.4.60