Update helm/chart-testing-action action to v2.7.0 #601

Job	Run time
Generate Charts	9s
Validate values schema json (cron-jobs)	5s
Validate values schema json (default-backend)	5s
Validate values schema json (docker-hub-exporter)	4s
Validate values schema json (pi-hole-exporter)	6s
Ensure cron-jobs README is up to date	4s
Validate values schema json (redirect)	4s
Ensure default-backend README is up to date	4s
Validate values schema json (redis-db-assignment-operator)	5s
Ensure docker-hub-exporter README is up to date	4s
Ensure pi-hole-exporter README is up to date	5s
Ensure redirect README is up to date	9s
Ensure redis-db-assignment-operator README is up to date	4s
Lint	18s
Test on Kubernetes v1.23	7m 12s
Test on Kubernetes v1.24	7m 51s
Test on Kubernetes v1.25	7m 22s
Test on Kubernetes v1.26	7m 20s
Test on Kubernetes v1.27	7m 32s
Test on Kubernetes v1.28	6m 51s
Test on Kubernetes v1.29	5m 59s
Test on Kubernetes v1.30	5m 59s
Test on Kubernetes v1.31	5m 53s
	1h 3m 25s

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