build(deps): bump flask from 3.0.3 to 3.1.3 in /nipap-www

Bumps [flask](https://github.com/pallets/flask) from 3.0.3 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@3.0.3...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]

nipap-www/pyproject.toml

@@ -14,7 +14,7 @@ classifiers = [
 ]
 keywords = ["nipap"]
 dependencies = [
-  "Flask==3.0.3",
+  "Flask==3.1.3",
   "Jinja2==3.1.6",
   "nipap",
   "pynipap",