ci: cleanup matrix build

Author: johnbellone

.github/workflows/ci.yaml

@@ -5,11 +5,10 @@ on:
   - pull_request
 jobs:
   build:
-    runs-on: ${{ matrix.go }}
+    runs-on: ubuntu-latest
     strategy:
       matrix:
-        go: [1.20.x, 1.21.x, 1.22.x]
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        go: [stable]
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v5