Bump flask in /v2/load-generator/backend/services/recommendation

Bumps [flask](https://github.com/pallets/flask) from 1.1.4 to 2.2.5.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/main/CHANGES.rst)
- [Commits](pallets/flask@1.1.4...2.2.5)

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

Signed-off-by: dependabot[bot] <support@github.com>

v2/load-generator/backend/services/recommendation/requirements.txt

@@ -1,4 +1,4 @@
-Flask==1.1.4
+Flask==2.2.5
 # opencensus-ext-stackdriver 0.7.4 depends on google-cloud-monitoring<1.0.0 and >=0.30.0
 google-cloud-monitoring==0.36.0
 google-cloud-trace==0.24.0