Update oboukili/argocd requirement from ~> 5.5 to ~> 6.1 in /argocd_app

Updates the requirements on [oboukili/argocd](https://github.com/oboukili/terraform-provider-argocd) to permit the latest version.
- [Release notes](https://github.com/oboukili/terraform-provider-argocd/releases)
- [Changelog](https://github.com/argoproj-labs/terraform-provider-argocd/blob/master/.goreleaser.yml)
- [Commits](argoproj-labs/terraform-provider-argocd@v5.5.0...v6.1.1)

---
updated-dependencies:
- dependency-name: oboukili/argocd
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

argocd_app/main.tf

@@ -4,7 +4,7 @@ terraform {
   required_providers {
     argocd = {
       source  = "oboukili/argocd"
-      version = "~> 5.5"
+      version = "~> 6.1"
     }
   }
 }