chore(nifi): Update git-sync ahead of Stackable Release 25.7.0

[NickLarsenNZ]

Part of #1066.

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Please add the scheduled-for/20XX-XX label, and add to the Stackable Engineering project.

Update tasks

• Update git-sync in versions.py to 4.4.1.

Related Pull Requests

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Delete any items that do not apply so that all applicable items can be checked.
For example, if you add release notes to the documentation repository, you do not need the latter two criteria.

• Link to the docker-images PR (product update)

Acceptance

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This list should be completed by the assignee(s), once respective PRs have been merged. Once all items have been
checked, the issue can be moved into Development: Done.

• Can build image (either locally, or in CI)
• Kuttl smoke tests passes (either locally, or in CI)

Testing instructions

# See the latest version at https://pypi.org/project/image-tools-stackabletech/
pip install image-tools-stackabletech==0.0.16

bake --product nifi=x.y.z # where x.y.z is the new version added in this PR

kind load docker-image oci.stackable.tech/sdp/nifi:x.y.z-stackable0.0.0-dev

# Change directory into the nifi-operator repository and update the
# product version in tests/test-definition.yaml
./scripts/run-tests --test-suite smoke-latest # or similar

Please consider updating this template if these instructions are wrong, or
could be made clearer.