CI: Add GHC 9.6.2 to "Build & Test - Nixpkgs" job matrix

Author: avdv

.github/workflows/workflow.yaml

@@ -55,13 +55,16 @@ jobs:
         ghc:
           - 9.2.8
           - 9.4.6
+          - 9.6.2
         exclude:
           - module: rules_haskell_nix
             bzlmod: false
           # TODO: in a MODULE.bazel file we declare version specific dependencies, would need to use stack snapshot json
           #       and stack config per GHC version
           - ghc: 9.4.6
             bzlmod: true
+          - ghc: 9.6.2
+            bzlmod: true
     runs-on: ${{ matrix.os }}
     steps:
       - if: ${{ matrix.os == 'ubuntu-latest' }}