Merge pull request #29 from lyz-code/fix/automatic-dependencies-update

ci: set up python for the update job

.github/workflows/update.yml

@@ -2,7 +2,7 @@
 name: Update
 on:  # yamllint disable-line rule:truthy
   schedule:
-    - cron: 0 * * * *
+    - cron: 11 * * * *
 
 jobs:
   Update:
@@ -12,6 +12,10 @@ jobs:
         with:
           persist-credentials: false
           fetch-depth: 0
+      - name: Set up Python 3.7
+        uses: actions/setup-python@v1
+        with:
+          python-version: 3.7
       - name: Install dependencies
         run: pip install pip-tools
       - name: Update requirements