Use ghc-9.12.2

Author: jorisdral

.github/workflows/haskell.yml

@@ -21,7 +21,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ghc: ["8.10.7", "9.2.8", "9.4.8", "9.6.4", "9.8.2", "9.10.1", "9.12.1"]
+        ghc: ["8.10.7", "9.2.8", "9.4.8", "9.6.4", "9.8.2", "9.10.1", "9.12.2"]
         cabal: ["3.10.2.1"]
         os: [ubuntu-latest, windows-latest, macOS-latest]
         cabal-flags: [""]