[prometheus-pushgateway] Update dependency prometheus/pushgateway to v1.11.2 (#6280)

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

Author: renovate[bot]

charts/prometheus-pushgateway/Chart.yaml

@@ -1,9 +1,9 @@
 apiVersion: v2
 # renovate: github-releases=prometheus/pushgateway
-appVersion: v1.11.1
+appVersion: v1.11.2
 description: A Helm chart for prometheus pushgateway
 name: prometheus-pushgateway
-version: 3.4.1
+version: 3.4.2
 home: https://github.com/prometheus/pushgateway
 sources:
   - https://github.com/prometheus/pushgateway