ci: use matrix strategy to test go1.23, go1.24, go1.25

- Adds `go vet` for linting
- Adds `staticcheck` for static analysis

Author: aws-gopher

.github/workflows/ci.yaml

@@ -12,15 +12,16 @@ on:
 jobs:
   test:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        go-version: [ '1.23', '1.24', '1.25' ]
     steps:
       - uses: actions/checkout@v4
-      - name: Setup Go
-        uses: actions/setup-go@v5
+      - uses: actions/setup-go@v5
         with:
-          go-version-file: go.mod
-          cache: true
-      - name: Install dependencies
-        run: |
-          go get .
-      - name: Run tests
-        run: go test -race -v ./...
+          go-version: ${{ matrix.go-version }}
+      - run: go mod download
+      - run: go vet ./...
+      - uses: dominikh/staticcheck-action@v1
+        with: { install-go: false }
+      - run: go test -v ./...