Update wtforms requirement from ~=3.1.0 to ~=3.1.1 in /vwsfriend

Updates the requirements on [wtforms](https://github.com/wtforms/wtforms) to permit the latest version.
- [Release notes](https://github.com/wtforms/wtforms/releases)
- [Changelog](https://github.com/wtforms/wtforms/blob/master/CHANGES.rst)
- [Commits](pallets-eco/wtforms@3.1.0...3.1.1)

---
updated-dependencies:
- dependency-name: wtforms
  dependency-type: direct:production
...

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

vwsfriend/requirements.txt

@@ -8,7 +8,7 @@ Werkzeug~=3.0.1
 Flask~=3.0.0
 flask-login~=0.6.3
 flask-caching~=2.1.0
-WTForms~=3.1.0
+WTForms~=3.1.1
 flask_wtf~=1.2.1
 flask_sqlalchemy~=3.1.1
 alembic~=1.12.1