Fix CI lint failure

Author: black-binary

.github/workflows/lint.yaml

@@ -13,7 +13,7 @@ jobs:
       - uses: actions/checkout@v2
 
       - name: Set current week of the year in environnement
-        run: echo "::set-env name=CURRENT_WEEK::$(Get-Date -UFormat %V)"
+        run: echo "CURRENT_WEEK=$(date +%V)" >> $GITHUB_ENV
 
       - uses: actions-rs/toolchain@v1
         with: