github: Update GH actions versions

Author: bep

.github/workflows/test.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ${{ matrix.platform }}
     steps:
       - name: Install Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@0a12ed9d6a96ab950c8f026ed9f722fe0da7ef32 # v5.0.2
         with:
           go-version: ${{ matrix.go-version }}
       - name: Install staticcheck
@@ -22,7 +22,7 @@ jobs:
         run: echo "$(go env GOPATH)/bin" >> $GITHUB_PATH
         shell: bash
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
       - name: Fmt
         if: matrix.platform != 'windows-latest' # :(
         run: "diff <(gofmt -d .) <(printf '')"