Bump flask from 3.0.2 to 3.1.3 in /examples/authorization_by_code

Bumps [flask](https://github.com/pallets/flask) from 3.0.2 to 3.1.3.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/main/CHANGES.rst)
- [Commits](pallets/flask@3.0.2...3.1.3)

---
updated-dependencies:
- dependency-name: flask
  dependency-version: 3.1.3
  dependency-type: direct:production
...

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

Author: dependabot[bot]

examples/authorization_by_code/requirements.txt

@@ -1,2 +1,2 @@
-flask==3.0.2
+flask==3.1.3
 pyimgur==0.7.2