Bump flask-cors from 3.0.10 to 4.0.2 in /src/loadgenerator

Bumps [flask-cors](https://github.com/corydolphin/flask-cors) from 3.0.10 to 4.0.2.
- [Release notes](https://github.com/corydolphin/flask-cors/releases)
- [Changelog](https://github.com/corydolphin/flask-cors/blob/main/CHANGELOG.md)
- [Commits](corydolphin/flask-cors@3.0.10...4.0.2)

---
updated-dependencies:
- dependency-name: flask-cors
  dependency-type: direct:production
...

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

Author: dependabot[bot]

src/loadgenerator/requirements.txt

@@ -8,7 +8,7 @@ ConfigArgParse==1.5.3
 Deprecated==1.2.13
 Flask==2.2.2
 Flask-BasicAuth==0.2.0
-Flask-Cors==3.0.10
+Flask-Cors==4.0.2
 gevent==21.12.0
 geventhttpclient==2.0.2
 googleapis-common-protos==1.56.4