Merge pull request #28 from deNBI/renovate/actions-checkout-4.x

chore(deps): update actions/checkout action to v4

.github/workflows/transfer_files.yml

@@ -13,7 +13,7 @@ jobs:
       outputs:
         matrix: ${{ steps.set-matrix.outputs.matrix }}
       steps:
-        - uses: actions/checkout@v2
+        - uses: actions/checkout@v4
         - id: set-matrix
           run: echo "::set-output name=matrix::$(ls databases/*.json | jq -R -s -c 'split("\n")[:-1]')"