Update Nexus to v3.41.1

Package	Update	Change
registry1.dso.mil/ironbank/sonatype/nexus/nexus	patch	3.41.0-01 -> 3.41.1-01

Other changes:

• Removed the (not istio) conditional on ingress - in my opinion this is an unnecessary extra conditional/variation from upstream for us to maintain. Other packages have similar ingress conditionals and I believe deploying both an ingress and Istio VS works fine.
• Modified the dev maintenance doc to clarify some things around testing and upgrading. Happy to revert or change anything that isn't clear - the goal was to make it more obvious how to test and clean up some unnecessary items. Preview here - https://repo1.dso.mil/platform-one/big-bang/apps/developer-tools/nexus/-/blob/renovate/ironbank/docs/DEVELOPMENT_MAINTENANCE.md