Bump flask from 3.0.3 to 3.1.0

Bumps [flask](https://github.com/pallets/flask) from 3.0.3 to 3.1.0.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/main/CHANGES.rst)
- [Commits](pallets/flask@3.0.3...3.1.0)

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

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

requirements.txt

@@ -1,7 +1,7 @@
 urllib3<1.27,>1.21.1  # avoid caching bug
 requests_cache
 ckanapi>=3.5
-flask==3.0.3
+flask==3.1.0
 #git+https://github.com/HXLStandard/libhxl-python.git@dev#egg=libhxl # for development
 libhxl==5.2.2         # for release
 flask-caching