Bump humanize from 4.8.0 to 4.9.0

Bumps [humanize](https://github.com/python-humanize/humanize) from 4.8.0 to 4.9.0.
- [Release notes](https://github.com/python-humanize/humanize/releases)
- [Commits](https://github.com/python-humanize/humanize/compare/4.8.0...4.9.0)

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

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

pyproject.toml

@@ -18,7 +18,7 @@ flask-wtf = "^1.2"
 govuk-bank-holidays = "==0.13"
 govuk-frontend-jinja = {git = "https://github.com/alphagov/govuk-frontend-jinja.git", tag = "v0.5.8-alpha"}
 gunicorn = {version = "==21.2.0", extras = ["eventlet"]}
-humanize = "~=4.8"
+humanize = "~=4.9"
 itsdangerous = "~=2.1"
 jinja2 = "~=3.1"
 newrelic = "*"