build(deps): bump flask from 3.1.2 to 3.1.3 in /library_api_code

Bumps [flask](https://github.com/pallets/flask) from 3.1.2 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@3.1.2...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]

library_api_code/requirements.txt

@@ -4,7 +4,7 @@ click==8.3.0
 colorama==0.4.6
 Deprecated==1.3.1
 ecdsa==0.19.2
-Flask==3.1.2
+Flask==3.1.3
 Flask-Caching==2.3.1
 Flask-Limiter==4.0.0
 flask-marshmallow==1.3.0