build(deps): bump caikit-nlp from 0.5.14 to 0.5.15

Bumps [caikit-nlp](https://github.com/caikit/caikit-nlp) from 0.5.14 to 0.5.15.
- [Release notes](https://github.com/caikit/caikit-nlp/releases)
- [Commits](caikit/caikit-nlp@v0.5.14...v0.5.15)

---
updated-dependencies:
- dependency-name: caikit-nlp
  dependency-version: 0.5.15
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]