build(deps): bump werkzeug from 2.2.3 to 3.1.5 in /css-inline/tests

Bumps [werkzeug](https://github.com/pallets/werkzeug) from 2.2.3 to 3.1.5.
- [Release notes](https://github.com/pallets/werkzeug/releases)
- [Changelog](https://github.com/pallets/werkzeug/blob/main/CHANGES.rst)
- [Commits](pallets/werkzeug@2.2.3...3.1.5)

---
updated-dependencies:
- dependency-name: werkzeug
  dependency-version: 3.1.5
  dependency-type: direct:production
...

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

Author: dependabot[bot]

css-inline/tests/requirements-test.in

@@ -1,3 +1,3 @@
 # Python 3.7 compatibility
 flask<2.3
-werkzeug<2.3
+werkzeug<3.2

css-inline/tests/requirements-test.txt

@@ -16,7 +16,7 @@ markupsafe==2.1.3
     # via
     #   jinja2
     #   werkzeug
-werkzeug==2.2.3
+werkzeug==3.1.5
     # via
     #   -r requirements-test.in
     #   flask