build(deps): bump validators from 0.24.0 to 0.28.1 in /dblp-fetcher

Bumps [validators](https://github.com/python-validators/validators) from 0.24.0 to 0.28.1.
- [Release notes](https://github.com/python-validators/validators/releases)
- [Changelog](https://github.com/python-validators/validators/blob/master/CHANGES.md)
- [Commits](python-validators/validators@0.24.0...0.28.1)

---
updated-dependencies:
- dependency-name: validators
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

dblp-fetcher/poetry.lock

@@ -14,7 +14,7 @@ google-api-python-client = "^2.124.0"
 google-auth-httplib2 = "^0.2.0"
 google-auth-oauthlib = "^1.2.0"
 requests = "^2.31.0"
-validators = "^0.24.0"
+validators = "^0.28.1"
 
 [tool.poetry.dev-dependencies]
 pytest = "^8.1"