Merge pull request #117 from opensafely-core/madwort-patch-1

Allow dependabot to update github actions

Author: madwort

.github/dependabot.yml

@@ -7,3 +7,7 @@ updates:
       interval: "daily"
     allow:
       - dependency-name: "opensafely-cohort-extractor"
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"