Bump flask from 1.1.4 to 2.3.2 in /api

Bumps [flask](https://github.com/pallets/flask) from 1.1.4 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@1.1.4...2.3.2)

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

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

Author: dependabot[bot]

api/requirements.txt

@@ -1,4 +1,4 @@
-Flask==1.1.4
+Flask==2.3.2
 Werkzeug==1.0.1
 requests==2.24.0
 python-dotenv==0.14.0