Bump lightly from 1.5.4 to 1.5.5 in /requirements (#2098)

Bumps [lightly](https://github.com/lightly-ai/lightly) from 1.5.4 to 1.5.5.
- [Release notes](https://github.com/lightly-ai/lightly/releases)
- [Commits](https://github.com/lightly-ai/lightly/compare/v1.5.4...v1.5.5)

---
updated-dependencies:
- dependency-name: lightly
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements/required.txt

@@ -5,7 +5,7 @@ setuptools==70.0.0
 einops==0.8.0
 fiona==1.9.6
 kornia==0.7.2
-lightly==1.5.4
+lightly==1.5.5
 lightning[pytorch-extra]==2.2.5
 matplotlib==3.9.0
 numpy==1.26.4