Update PR CI workflow: Drop GHC 8.10 and add 9.10

GHC 8.10 was dropped from Hydra (CI) some time ago, so it needs to be
dropped from GitHub CI too. GHC 9.10 was broken a while ago in the
upstream devShell (input-output-hk/devx), but hopefully it is fixed now.

Author: sgillespie

.github/workflows/haskell.yml

@@ -20,7 +20,7 @@ jobs:
       matrix:
         os: [ubuntu-latest]
         # TODO: Add ghc910 when input-output-hk/devx is fixed
-        compiler-nix-name: [ghc810, ghc96, ghc98, ghc912]
+        compiler-nix-name: [ghc96, ghc98, ghc910, ghc912]
         include:
           # We want a single job, because macOS runners are scarce.
           - os: macos-latest