build(deps): bump flask from 1.1.2 to 3.1.3 in /requirements

Bumps [flask](https://github.com/pallets/flask) from 1.1.2 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@1.1.2...3.1.3)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements/core.txt

@@ -17,7 +17,7 @@ everett==1.0.2
 Faker==4.1.3
 Flask_Cors==3.0.9
 Flask_RESTful==0.3.8
-Flask==1.1.2
+Flask==3.1.3
 Flask-GraphQL==2.0.1
 graphene==2.1.8
 graphql_core==2.3.2