build(deps): bump govuk_app_config from 2.10.0 to 3.0.0
build(deps): bump govuk_app_config from 2.10.0 to 3.0.0

Bumps [govuk_app_config](https://github.com/alphagov/govuk_app_config) from 2.10.0 to 3.0.0.
- [Release notes](https://github.com/alphagov/govuk_app_config/releases)
- [Changelog](https://github.com/alphagov/govuk_app_config/blob/master/CHANGELOG.md)
- [Commits](https://github.com/alphagov/govuk_app_config/compare/v2.10.0...v3.0.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
alphagov/collections-publisher,alphagov/collections-publisher,alphagov/collections-publisher