Bump flask-wtf from 1.1.1 to 1.2.1

Bumps [flask-wtf](https://github.com/wtforms/flask-wtf) from 1.1.1 to 1.2.1.
- [Release notes](https://github.com/wtforms/flask-wtf/releases)
- [Changelog](https://github.com/wtforms/flask-wtf/blob/main/docs/changes.rst)
- [Commits](https://github.com/wtforms/flask-wtf/compare/v1.1.1...v1.2.1)

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

Signed-off-by: dependabot[bot] <support@github.com>

pyproject.toml

@@ -14,7 +14,7 @@ exceptiongroup = "==1.1.3"
 flask = "~=2.3"
 flask-basicauth = "~=0.2"
 flask-login = "~=0.6"
-flask-wtf = "~=1.1"
+flask-wtf = "~=1.2"
 poetry = "==1.6.1"
 govuk-bank-holidays = "==0.13"
 govuk-frontend-jinja = {git = "https://github.com/alphagov/govuk-frontend-jinja.git", tag = "v0.5.8-alpha"}