Bump @natlibfi/fixugen in the production-dependencies group

Bumps the production-dependencies group with 1 update: [@natlibfi/fixugen](https://github.com/natlibfi/fixugen-js).


Updates `@natlibfi/fixugen` from 2.0.5 to 2.0.6
- [Release notes](https://github.com/natlibfi/fixugen-js/releases)
- [Commits](NatLibFi/fixugen-js@v2.0.5...v2.0.6)

---
updated-dependencies:
- dependency-name: "@natlibfi/fixugen"
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: production-dependencies
...

Signed-off-by: dependabot[bot] <[email protected]>