Bump flask from 1.1.4 to 2.1.2

Bumps [flask](https://github.com/pallets/flask) from 1.1.4 to 2.1.2.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/main/CHANGES.rst)
- [Commits](pallets/flask@1.1.4...2.1.2)

---
updated-dependencies:
- dependency-name: flask
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

requirements-freeze.txt

@@ -14,7 +14,7 @@ csh-ldap==2.3.1
 ddtrace==0.57.3
 defusedxml==0.7.1
 dnspython==2.2.1
-Flask==1.1.4
+Flask==2.1.2
 Flask-gzip==0.2
 Flask-Mail==0.9.1
 Flask-Migrate==2.7.0

requirements.txt

@@ -2,7 +2,7 @@ Flask-Gzip==0.2
 Flask-Mail==0.9.1
 Flask-Migrate~=2.7.0
 Flask-pyoidc~=3.7.0
-Flask~=1.1.4
+Flask~=2.1.2
 csh_ldap~=2.3.1
 ddtrace==0.57.3
 flask_sqlalchemy~=2.5.1