Bump github.com/hashicorp/terraform-plugin-testing from 1.5.1 to 1.6.0#3

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dependabot/go_modules/github.com/hashicorp/terraform-plugin-testing-1.6.0EducationPerfect/terraform-provider-spicedb:dependabot/go_modules/github.com/hashicorp/terraform-plugin-testing-1.6.0Copy head branch name to clipboard