Stick to GHC 8.10.7 until changelog-d is updated

.github/workflows/changelogs.yml

@@ -35,8 +35,9 @@ jobs:
       - name: ghcup
         run: |
           ghcup config set cache true
-          ghcup install ghc recommended
-          ghcup set ghc recommended
+          ghcup install ghc 8.10.7
+          ghcup set ghc 8.10.7
+      # GHC 8.10.7 needed due to https://github.com/phadej/changelog-d/pull/2
       - name: Update Hackage index
         run: cabal v2-update
       # Cannot install it from tarball due to