Bump notifications-python-client from 6.3.0 to 8.0.1

Bumps [notifications-python-client](https://github.com/alphagov/notifications-python-client) from 6.3.0 to 8.0.1.
- [Changelog](https://github.com/alphagov/notifications-python-client/blob/main/CHANGELOG.md)
- [Commits](https://github.com/alphagov/notifications-python-client/compare/6.3.0...8.0.1)

---
updated-dependencies:
- dependency-name: notifications-python-client
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

pyproject.toml

@@ -52,7 +52,7 @@ jsonschema = {version = "==4.17.0", extras = ["format"]}
 lxml = "==4.9.3"
 marshmallow = "==3.20.1"
 marshmallow-sqlalchemy = "==0.29.0"
-notifications-python-client = "==6.3.0"
+notifications-python-client = "==8.0.1"
 oscrypto = "==1.3.0"
 poetry = "==1.6.1"
 poetry-dotenv-plugin = "==0.2.0"