maint(deps): bump github.com/hashicorp/terraform-plugin-mux

Bumps the hashicorp group with 1 update: [github.com/hashicorp/terraform-plugin-mux](https://github.com/hashicorp/terraform-plugin-mux).


Updates `github.com/hashicorp/terraform-plugin-mux` from 0.15.0 to 0.16.0
- [Release notes](https://github.com/hashicorp/terraform-plugin-mux/releases)
- [Changelog](https://github.com/hashicorp/terraform-plugin-mux/blob/main/CHANGELOG.md)
- [Commits](hashicorp/terraform-plugin-mux@v0.15.0...v0.16.0)

---
updated-dependencies:
- dependency-name: github.com/hashicorp/terraform-plugin-mux
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: hashicorp
...

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

go.mod

@@ -7,7 +7,7 @@ require (
 	github.com/hashicorp/go-retryablehttp v0.7.5
 	github.com/hashicorp/terraform-plugin-framework v1.8.0
 	github.com/hashicorp/terraform-plugin-go v0.23.0
-	github.com/hashicorp/terraform-plugin-mux v0.15.0
+	github.com/hashicorp/terraform-plugin-mux v0.16.0
 	github.com/hashicorp/terraform-plugin-sdk/v2 v2.33.0
 	github.com/hashicorp/terraform-plugin-testing v1.7.0
 	github.com/joho/godotenv v1.5.1