Update CI build matrix

Author: msteinert

.github/workflows/test.yaml

@@ -4,12 +4,12 @@ jobs:
   test:
     strategy:
       matrix:
-        go-version: [1.20.x, 1.21.x]
+        go-version: [1.23.x, 1.24.x]
         os: [ubuntu-latest]
     runs-on: ${{ matrix.os }}
     steps:
     - name: Install Go
-      uses: actions/setup-go@v4
+      uses: actions/setup-go@v5
       with:
         go-version: ${{ matrix.go-version }}
     - name: Update system