Bump CI to ghc-9.6

Author: TristanCacqueray

.github/workflows/main.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ghc: ['8.10', '9.2']
+        ghc: ['9.6']
     name: Haskell GHC ${{ matrix.ghc }}
     steps:
     - uses: actions/checkout@v2

matrix-client/matrix-client.cabal

@@ -22,7 +22,7 @@ category:            Network
 build-type:          Simple
 extra-doc-files:     CHANGELOG.md
 extra-source-files:  test/data/*.json
-tested-with:         GHC == 8.10.7, GHC == 9.2.4
+tested-with:         GHC == 9.6.6
 
 source-repository head
   type:                git