Update actions/checkout action to v3 (#520)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v2.4.0
+      uses: actions/checkout@v3.0.0
       with:
         token: ${{ secrets.ARCHIBOT_GITHUB_TOKEN }}
 

.github/workflows/translations.yml

@@ -10,7 +10,7 @@ jobs:
 
     steps:
     - name: Checkout code
-      uses: actions/checkout@v2.4.0
+      uses: actions/checkout@v3.0.0
       with:
         token: ${{ secrets.ARCHIBOT_GITHUB_TOKEN }}