Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/release.yml

@@ -13,7 +13,7 @@ jobs:
       name: "release"
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v6
       - name: Set up qemu
         uses: docker/setup-qemu-action@v2
         with:

.github/workflows/test.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v6
       - name: Set up qemu
         uses: docker/setup-qemu-action@v2
         with: