Bump wtforms from 3.1.2 to 3.2.1

Bumps [wtforms](https://github.com/pallets-eco/wtforms) from 3.1.2 to 3.2.1.
- [Release notes](https://github.com/pallets-eco/wtforms/releases)
- [Changelog](https://github.com/pallets-eco/wtforms/blob/main/CHANGES.rst)
- [Commits](pallets-eco/wtforms@3.1.2...3.2.1)

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

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

tests/requirements.txt

@@ -11,19 +11,19 @@ click==8.1.7
 coverage[toml]==7.6.3
     # via pytest-cov
 deepmerge==2.0
-    # via -r requirements.in
+    # via -r tests/requirements.in
 dnspython==2.7.0
     # via email-validator
 email-validator==2.2.0
-    # via -r requirements.in
+    # via -r tests/requirements.in
 flask==3.0.3
     # via
-    #   -r requirements.in
+    #   -r tests/requirements.in
     #   flask-wtf
 flask-wtf==1.2.1
-    # via -r requirements.in
+    # via -r tests/requirements.in
 govuk-frontend-jinja==3.4.0
-    # via -r requirements.in
+    # via -r tests/requirements.in
 idna==3.10
     # via email-validator
 iniconfig==2.0.0
@@ -48,10 +48,10 @@ pluggy==1.5.0
 pytest==8.3.3
     # via pytest-cov
 pytest-cov==5.0.0
-    # via -r requirements.in
+    # via -r tests/requirements.in
 pyyaml==6.0.2
-    # via -r requirements.in
+    # via -r tests/requirements.in
 werkzeug==3.0.4
     # via flask
-wtforms==3.1.2
+wtforms==3.2.1
     # via flask-wtf