Upgraded System.Text.Json from 6.0.7 to 8.0.4

What's Changed

• Bump System.Text.Json from 6.0.7 to 8.0.4 in /src/AWSSecretManager.Configuration.Extension by @dependabot in #15

New Contributors

• @dependabot made their first contribution in #15

Full Changelog: v1.0.6...v1.0.7