Bump locust from 2.14.2 to 2.15.0 in /perf-tests

Bumps [locust](https://github.com/locustio/locust) from 2.14.2 to 2.15.0.
- [Release notes](https://github.com/locustio/locust/releases)
- [Changelog](https://github.com/locustio/locust/blob/master/CHANGELOG.md)
- [Commits](locustio/locust@2.14.2...2.15.0)

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

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

perf-tests/requirements.txt

@@ -1,7 +1,7 @@
 certifi==2022.12.7
 cffi==1.15.1
 kubernetes==26.1.0
-locust==2.14.2
+locust==2.15.0
 pytest==7.2.1
 pytest-html==3.2.0
 pytest-repeat==0.9.1