rebase: bump the github-dependencies group with 2 updates

Bumps the github-dependencies group with 2 updates: [github.com/aws/aws-sdk-go](https://github.com/aws/aws-sdk-go) and [github.com/aws/aws-sdk-go-v2/service/sts](https://github.com/aws/aws-sdk-go-v2).


Updates `github.com/aws/aws-sdk-go` from 1.50.16 to 1.50.21
- [Release notes](https://github.com/aws/aws-sdk-go/releases)
- [Commits](https://github.com/aws/aws-sdk-go/compare/v1.50.16...v1.50.21)

Updates `github.com/aws/aws-sdk-go-v2/service/sts` from 1.26.7 to 1.27.0
- [Release notes](https://github.com/aws/aws-sdk-go-v2/releases)
- [Commits](https://github.com/aws/aws-sdk-go-v2/compare/service/s3/v1.26.7...config/v1.27.0)

---
updated-dependencies:
- dependency-name: github.com/aws/aws-sdk-go
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: github-dependencies
- dependency-name: github.com/aws/aws-sdk-go-v2/service/sts
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: github-dependencies
...

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

vendor/github.com/aws/smithy-go/CHANGELOG.md

@@ -1,3 +1,10 @@
+# Release (2024-02-13)
+
+## Module Highlights
+* `github.com/aws/smithy-go`: v1.20.0
+  * **Feature**: Add codegen definition for sigv4a trait.
+  * **Feature**: Bump minimum Go version to 1.20 per our language support policy.
+
 # Release (2023-12-07)
 
 ## Module Highlights