rebase: Bump github.com/aws/aws-sdk-go-v2/service/sts

Bumps [github.com/aws/aws-sdk-go-v2/service/sts](https://github.com/aws/aws-sdk-go-v2) from 1.18.5 to 1.18.6.
- [Release notes](https://github.com/aws/aws-sdk-go-v2/releases)
- [Changelog](https://github.com/aws/aws-sdk-go-v2/blob/main/CHANGELOG.md)
- [Commits](https://github.com/aws/aws-sdk-go-v2/compare/config/v1.18.5...config/v1.18.6)

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

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

vendor/github.com/aws/aws-sdk-go-v2/service/sts/CHANGELOG.md

@@ -1,3 +1,7 @@
+# v1.18.6 (2023-03-10)
+
+* **Dependency Update**: Updated to the latest SDK module versions
+
 # v1.18.5 (2023-02-22)
 
 * **Bug Fix**: Prevent nil pointer dereference when retrieving error codes.

vendor/github.com/aws/aws-sdk-go-v2/service/sts/go_module_metadata.go

@@ -3,4 +3,4 @@
 package sts
 
 // goModuleVersion is the tagged release for this module
-const goModuleVersion = "1.18.5"
+const goModuleVersion = "1.18.6"