[prometheus-mongodb-exporter] add renovate for mongodb (#5518)

Signed-off-by: drfaust92 <[email protected]>

Author: DrFaust92

Diff for: charts/prometheus-mongodb-exporter/Chart.yaml

@@ -1,5 +1,6 @@
 apiVersion: v2
-appVersion: "0.43.1"
+# renovate: github=percona/mongodb_exporter
+appVersion: 0.43.1
 description: A Prometheus exporter for MongoDB metrics
 home: https://github.com/percona/mongodb_exporter
 keywords:
@@ -17,4 +18,4 @@ maintainers:
 name: prometheus-mongodb-exporter
 sources:
   - https://github.com/percona/mongodb_exporter
-version: 3.11.1
+version: 3.11.2