chore(nifi): Add version 2.9.0

[sbernauer]

Description

See discussion in https://stackable-workspace.slack.com/archives/C09ENHGRWR3/p1776331413012889.
This is for a customer that needs the fix from apache/nifi#10996.
Instead of back-porting I figured it actually be easy to simply bump the version.

Definition of Done Checklist

Note

Not all of these items are applicable to all PRs, the author should update this template to only leave the boxes in that are relevant.

Please make sure all these things are done and tick the boxes

• Changes are OpenShift compatible
• All added packages (via microdnf or otherwise) have a comment on why they are added
• Things not downloaded from Red Hat repositories should be mirrored in the Stackable repository and downloaded from there
• All packages should have (if available) signatures/hashes verified
• Add an entry to the CHANGELOG.md file
• Integration tests ran successfully

TIP: Running integration tests with a new product image

The image can be built and uploaded to the kind cluster with the following commands:

boil build <IMAGE> --image-version <RELEASE_VERSION> --strip-architecture --load
kind load docker-image <MANIFEST_URI> --name=<name-of-your-test-cluster>

See the output of boil to retrieve the image manifest URI for <MANIFEST_URI>.

[NickLarsenNZ]

LGTM

[sbernauer]

@copilot resolve the merge conflicts in this pull request
YOLO

[sbernauer]

@copilot Hello are you there mate? I need to merge this to get salary to feed my 10 children

[sbernauer]

@copilot Do you have an ETA on this one?

[sbernauer]

@copilot my children are starving. It's only a conflict in a changelog, don't give up, you can do this 👍

[sbernauer]

Just for the record: This was suggested to me by the GitHub UI. But it's broken 🥳

[NickLarsenNZ]

LGTM