Bump elasticsearch-dsl from 8.14.0 to 8.15.0 in /requirements (#2455)

Bumps [elasticsearch-dsl](https://github.com/elasticsearch/elasticsearch-dsl-py) from 8.14.0 to 8.15.0.
- [Release notes](https://github.com/elasticsearch/elasticsearch-dsl-py/releases)
- [Changelog](https://github.com/elastic/elasticsearch-dsl-py/blob/main/Changelog.rst)
- [Commits](elastic/elasticsearch-dsl-py@v8.14.0...v8.15.0)

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

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

Author: dependabot[bot]

requirements/project-requirements.txt

@@ -35,7 +35,7 @@ whitenoise==6.7.0
 daphne==4.1.0
 channels==4.1.0
 channels-redis==4.2.0
-elasticsearch-dsl==8.14.0
+elasticsearch-dsl==8.15.0
 
 # plugins
 GitPython==3.1.41