CI: Update macos version and drop compilers before ghc-9.6.7

Author: erikd

.github/workflows/haskell.yml

@@ -13,8 +13,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ghc: ["8.10.7", "9.2.8", "9.6", "9.8", "9.10", "9.12"]
-        os: [ubuntu-latest, macos-13, windows-latest]
+        ghc: ["9.6", "9.8", "9.10", "9.12", "9.14"]
+        os: [ubuntu-latest, macos-14, windows-latest]
 
     steps:
     - uses: actions/checkout@v1