CI: Upgrade actions/checkout (#2)

Author: CodeMan99

.github/workflows/release.yaml

@@ -7,7 +7,7 @@ jobs:
     if: ${{ github.ref == 'refs/heads/main' }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - name: "Publish Features"
         uses: devcontainers/action@v1

.github/workflows/test.yaml

@@ -21,7 +21,7 @@ jobs:
           - mcr.microsoft.com/devcontainers/base:ubuntu
           - mcr.microsoft.com/devcontainers/base:bullseye
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - name: "Install latest devcontainer CLI"
         run: npm install -g @devcontainers/cli
@@ -33,7 +33,7 @@ jobs:
     runs-on: ubuntu-latest
     continue-on-error: true
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - name: "Install latest devcontainer CLI"
         run: npm install -g @devcontainers/cli