Drop support for SWUpdate 2025.05

Signed-off-by: Stefano Babic <stefano.babic@swupdate.org>

recipes-support/swupdate/swupdate_2025.05.bb

@@ -1,3 +0,0 @@
-SRCBRANCH = "master"
-SRCREV = "498de8f1c086fae1eeeb64b045d0f861575b1e66"
-require swupdate.inc