Bump the service group across 1 directory with 3 updates (#987)

Bumps the service group with 3 updates in the /src/FeatureFlags.Service directory: [Azure.Data.Tables](https://github.com/Azure/azure-sdk-for-net), [Azure.Storage.Blobs](https://github.com/Azure/azure-sdk-for-net) and [Swashbuckle.AspNetCore](https://github.com/domaindrivendev/Swashbuckle.AspNetCore).


Updates `Azure.Data.Tables` from 12.8.3 to 12.9.0
- [Release notes](https://github.com/Azure/azure-sdk-for-net/releases)
- [Commits](Azure/azure-sdk-for-net@Azure.Data.Tables_12.8.3...Azure.Data.Tables_12.9.0)

Updates `Azure.Storage.Blobs` from 12.20.0 to 12.21.2
- [Release notes](https://github.com/Azure/azure-sdk-for-net/releases)
- [Commits](Azure/azure-sdk-for-net@Azure.Storage.Blobs_12.20.0...Azure.Storage.Blobs_12.21.2)

Updates `Swashbuckle.AspNetCore` from 6.6.2 to 6.7.0
- [Release notes](https://github.com/domaindrivendev/Swashbuckle.AspNetCore/releases)
- [Commits](domaindrivendev/Swashbuckle.AspNetCore@v6.6.2...v6.7.0)

---
updated-dependencies:
- dependency-name: Azure.Data.Tables
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: service
- dependency-name: Azure.Storage.Blobs
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: service
- dependency-name: Swashbuckle.AspNetCore
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: service
...

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

Author: dependabot[bot]