don't use notabug for backup git repos

notabug is unreliable, even as a backup.

why, just today, it was offline! all day.

i originally moved libreboot away from notabug,
to codeberg instead, but kept the notabug account
online, and i still push to it when it's online.

however, notabug seems to be in a terminal state
of neglect by its admins, so lbmk should not use it.

Signed-off-by: Leah Rowe <leah@libreboot.org>

config/git/stm32-vserprog

@@ -2,5 +2,5 @@
 	rev: 8fcf0a4d41800631b571fa7bbd1d8b251f0a2111
 	loc: stm32-vserprog
 	url: https://codeberg.org/libreboot/stm32-vserprog
-	bkup_url: https://notabug.org/libreboot/stm32-vserprog
+	bkup_url: https://git.disroot.org/libreboot/stm32-vserprog
 }