Bump notifications-python-client from 9.0.0 to 10.0.0 in /lambdas (#1950)

Bumps [notifications-python-client](https://github.com/alphagov/notifications-python-client) from 9.0.0 to 10.0.0.
- [Changelog](https://github.com/alphagov/notifications-python-client/blob/main/CHANGELOG.md)
- [Commits](alphagov/notifications-python-client@9.0.0...10.0.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

lambdas/lambda_layers/requirements3.txt

@@ -1 +1 @@
-notifications-python-client==9.0.0
+notifications-python-client==10.0.0