Bump flask from 2.2.3 to 2.3.2 in /server

Bumps [flask](https://github.com/pallets/flask) from 2.2.3 to 2.3.2.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/main/CHANGES.rst)
- [Commits](pallets/flask@2.2.3...2.3.2)

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

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

server/requirements.txt

@@ -5,7 +5,7 @@ tiktoken==0.3.3
 pydub==0.25.1
 espnet==202301
 espnet_model_zoo==0.1.7
-flask==2.2.3
+flask==2.3.2
 flask_cors==3.0.10
 waitress==2.1.2
 datasets==2.11.0