Bump ghc version to latest in ci

Author: AlistairB

.github/workflows/ci.yml

@@ -13,12 +13,12 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ghc: ['8.8.3', '8.10.1']
+        ghc: ['8.8.4', '8.10.2']
         deb: ['stretch', 'buster']
         include:
-          - ghc: '8.8.3'
+          - ghc: '8.8.4'
             ghc_minor: '8.8'
-          - ghc: '8.10.1'
+          - ghc: '8.10.2'
             ghc_minor: '8.10'
     steps:
       - uses: actions/checkout@v2
@@ -37,4 +37,3 @@ jobs:
           path: official-images
       - name: run official-images tests
         run: ./official-images/test/run.sh haskell:${{ matrix.ghc }}-${{ matrix.deb }}
-