[yt-dlp] Update to 2026.2.21 (#15449)

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"]

stubs/yt-dlp/yt_dlp/jsinterp.pyi

@@ -9,6 +9,7 @@ from yt_dlp.utils._utils import function_with_repr
 
 from .utils import ExtractorError
 
+def int_to_int32(n: int) -> int: ...
 def js_number_to_string(val: float, radix: int = 10) -> str: ...
 
 class JS_Undefined: ...