CI: Exclude old GHCs on MacOS

Author: ysangkok

.github/workflows/haskell.yml

@@ -15,6 +15,17 @@ jobs:
         os:    [macos-latest, ubuntu-latest]
         cabal: ["3.12"]
         ghc:   ["8.4.4", "8.6.5", "8.8.4", "8.10.7", "9.0.2", "9.2.8", "9.4.8", "9.6.6", "9.8.4", "9.10.1"]
+        exclude:
+          - os: macos-latest
+            ghc: "8.4.4"
+          - os: macos-latest
+            ghc: "8.6.5"
+          - os: macos-latest
+            ghc: "8.8.4"
+          - os: macos-latest
+            ghc: "8.10.7"
+          - os: macos-latest
+            ghc: "9.0.2"
 
     runs-on: ${{ matrix.os }}