[prometheus-mongodb-exporter] Update dependency percona/mongodb_exporter to v0.44.0 (#5522)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: helm-charts-renovate-helper[bot] <203471071+helm-charts-renovate-helper[bot]@users.noreply.github.com>

Author: renovate[bot]

charts/prometheus-mongodb-exporter/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v2
 # renovate: github=percona/mongodb_exporter
-appVersion: 0.43.1
+appVersion: 0.44.0
 description: A Prometheus exporter for MongoDB metrics
 home: https://github.com/percona/mongodb_exporter
 keywords:
@@ -18,4 +18,4 @@ maintainers:
 name: prometheus-mongodb-exporter
 sources:
   - https://github.com/percona/mongodb_exporter
-version: 3.11.2
+version: 3.12.0