ci: Bump GHC patch versions in tested-with

Author: github-actions[bot]

xmonad-contrib.cabal

@@ -38,7 +38,7 @@ cabal-version:      1.12
 build-type:         Simple
 bug-reports:        https://github.com/xmonad/xmonad-contrib/issues
 
-tested-with:        GHC == 8.8.4 || == 8.10.7 || == 9.0.2 || == 9.2.8 || == 9.4.8 || == 9.6.6 || == 9.8.2 || == 9.10.1
+tested-with:        GHC == 8.8.4 || == 8.10.7 || == 9.0.2 || == 9.2.8 || == 9.4.8 || == 9.6.6 || == 9.8.4 || == 9.10.1 || == 9.12.1
 
 source-repository head
   type:     git