ci: GHC 9.6.6 -> 9.6.7

Author: thomasjm

.github/workflows/ci.yml

@@ -33,7 +33,7 @@ jobs:
         # - "9.0.2"
         - "9.2.8"
         - "9.4.8"
-        - "9.6.6"
+        - "9.6.7"
         - "9.8.4"
     steps:
     - uses: cachix/install-nix-action@v27
@@ -82,8 +82,8 @@ jobs:
         - "1.31"
         - "1.32"
         compiler:
-        - ghc: "9.6.6"
-          yaml: "stack-9.6.6.yaml"
+        - ghc: "9.6.7"
+          yaml: "stack-9.6.7.yaml"
         - ghc: "9.8.4"
           yaml: "stack-9.8.4.yaml"
         - ghc: "9.10.2"