Update registry1.dso.mil/ironbank/bitnami/analytics/redis-exporter Docker tag to v1.74.0

This MR contains the following updates:

Package	Update	Change
registry1.dso.mil/ironbank/bitnami/analytics/redis-exporter (source)	minor	v1.73.0 -> v1.74.0

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• Followed upgrade instructions outlined in docs/DEVELOPMENT_MAINTENANCE.md
• Update Docs with new/updated steps as needed
• Tested and Validated Changes made with supporting info like logs or screenshots from test pipelines

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Upgrade Notices

The new chart version requires a password to be present in test-values.yaml when auth.enabled=true or when the value is not explicitly set. This is because Helm re-uses any existing Redis secrets during the upgrade. If a password is not provided, the upgrade will fail.