Remove GHC 8.10

It is 3 LTS releases behind and is no longer the 'recommended'
version for ghcup.

Author: AlistairB

.github/workflows/debian.yml

@@ -22,11 +22,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ghc: ['8.10.7', '9.0.2', '9.2.5', '9.4.4']
+        ghc: ['9.0.2', '9.2.5', '9.4.4']
         deb: ['buster', 'slim-buster']
         include:
-          - ghc: '8.10.7'
-            ghc_minor: '8.10'
           - ghc: '9.0.2'
             ghc_minor: '9.0'
           - ghc: '9.2.5'
@@ -59,13 +57,11 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ghc: ['8.10.7', '9.0.2', '9.2.5', '9.4.4']
+        ghc: ['9.0.2', '9.2.5', '9.4.4']
         # uraimo/run-on-arch-action does not support debian slim variants
         deb: ['buster']
         arch: ['aarch64']
         include:
-          - ghc: '8.10.7'
-            ghc_minor: '8.10'
           - ghc: '9.0.2'
             ghc_minor: '9.0'
           - ghc: '9.2.5'