Update build.yml

Author: sol

.github/workflows/build.yml

@@ -1,5 +1,9 @@
 name: build
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
 on:
   push:
     branches:
@@ -18,28 +22,19 @@ jobs:
     strategy:
       matrix:
         os:
-          - ubuntu-20.04
+          - ubuntu-latest
         ghc:
-          - '7.10'
-          - '8.0'
-          - '8.2'
-          - '8.4'
-          - '8.6'
-          - '8.8'
-          - '8.10'
-          - '9.0'
-          - '9.2'
-          - '9.4'
-          - '9.6'
           - '9.8'
+          - '9.10'
+          - '9.12'
         include:
           - os: macos-latest
-            ghc: latest
+            ghc: system
           - os: windows-latest
-            ghc: latest
+            ghc: system
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: hspec/setup-haskell@v1
         with:
           ghc-version: ${{ matrix.ghc }}