Add pip ecosystem to dependabot

Signed-off-by: Christian König <ckoenig@posteo.de>

.github/dependabot.yml

@@ -19,6 +19,16 @@ updates:
     target-branch: dev
     reviewers:
       - "pi-hole/docker-maintainers"
+  - package-ecosystem: pip
+    directory: "/test"
+    schedule:
+      interval: weekly
+      day: saturday
+      time: "10:00"
+    open-pull-requests-limit: 10
+    target-branch: dev
+    reviewers:
+      - "pi-hole/docker-maintainers"
   # Maintain dependencies for GitHub Actions development-v6
   - package-ecosystem: "github-actions"
     directory: "/"
@@ -38,3 +48,13 @@ updates:
     target-branch: development-v6
     reviewers:
       - "pi-hole/docker-maintainers"
+  - package-ecosystem: pip
+    directory: "/test"
+    schedule:
+      interval: weekly
+      day: saturday
+      time: "10:00"
+    open-pull-requests-limit: 10
+    target-branch: development-v6
+    reviewers:
+      - "pi-hole/docker-maintainers"