15.1.1 "purple-plush" (2023-01-18)

Commit	Description
	schematics: don't migrate unknown stylesheet formats (#26450)
	select: active class not removed from reset option when new value is assigned through form control (#26414)
	slider: Use non-deprecated theme key (#26378)

Special Thanks

Alan Agius, Alka Vats, Kevin Vizcarra, Kristiyan Kostadinov and Paul Gschwendtner