Have dependabot target the develop branch (#290)

[ROCm/rocdecode commit: 85895d61c5]

projects/rocdecode/.github/dependabot.yml

@@ -10,7 +10,7 @@ updates:
     open-pull-requests-limit: 10
     schedule:
       interval: "daily"
-    target-branch: "master"
+    target-branch: "develop"
     labels:
       - "documentation"
       - "dependencies"