Bump actions/checkout to v3

Author: motoki317

.github/workflows/release.yml

@@ -20,7 +20,7 @@ jobs:
       # GITHUB_REF value: refs/heads/v*
       run: echo "VERSION=$(echo ${GITHUB_REF:11})" >> $GITHUB_ENV
 
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
 
     - name: Set up QEMU
       uses: docker/setup-qemu-action@v2