[stubsabot] Bump yt-dlp to 2026.2.21

Release: https://pypi.org/pypi/yt-dlp/2026.2.21
Repository: https://github.com/yt-dlp/yt-dlp
Typeshed stubs: https://github.com/python/typeshed/tree/main/stubs/yt-dlp
Diff: yt-dlp/yt-dlp@2026.02.04...2026.02.21

Stubsabot analysis of the diff between the two releases:
 - 4 public Python files have been added: `yt_dlp/extractor/locipo.py`, `yt_dlp/extractor/matchitv.py`, `yt_dlp/extractor/tvo.py`, `yt_dlp/extractor/visir.py`.
 - 0 files included in typeshed's stubs have been deleted.
 - 6 files included in typeshed's stubs have been modified or renamed: `yt_dlp/cookies.py`, `yt_dlp/extractor/common.py`, `yt_dlp/jsinterp.py`, `yt_dlp/options.py`, `yt_dlp/utils/_utils.py`, `yt_dlp/version.py`.
 - Total lines of Python code added: 1468.
 - Total lines of Python code deleted: 342.

If stubtest fails for this PR:
- Leave this PR open (as a reminder, and to prevent stubsabot from opening another PR)
- Fix stubtest failures in another PR, then close this PR

Note that you will need to close and re-open the PR in order to trigger CI

Author: stubsabot

stubs/yt-dlp/METADATA.toml

@@ -1,3 +1,3 @@
-version = "2026.2.4"
+version = "2026.2.21"
 upstream_repository = "https://github.com/yt-dlp/yt-dlp"
 requires = ["websockets"]