build: update pipeline conventi to latest

To use the nevest version for now

.drone.yml

@@ -9,7 +9,7 @@ steps:
     commands:
       - git fetch --tags
   - name: Update version and changelog
-    image: registry.riba-interactive.de/conventi:1
+    image: registry.riba-interactive.de/conventi:latest
   - name: Commit changelog updates
     image: alpine/git
     commands:
@@ -17,7 +17,7 @@ steps:
       - git commit -m "version and changelog update [CI SKIP]"
       - git push origin $DRONE_TARGET_BRANCH
   - name: Tag commit
-    image: registry.riba-interactive.de/conventi:1
+    image: registry.riba-interactive.de/conventi:latest
     commands:
       - export VERSION=$(conventi.sh get_version)
       - git tag -am "Tagging new version $VERSION" "$VERSION"