fix: staticcheck S1039

[tenthirtyam]

Description

Fixes unnecessary use of fmt.Sprint.

Before:

~/Downloads/terraform-provider-vsphere git:[fix/staticcheck-S1039]
golangci-lint run
vsphere/resource_vsphere_virtual_machine_class_test.go:42:9: S1039: unnecessary use of fmt.Sprintf (staticcheck)
        return fmt.Sprintf(`
               ^
vsphere/resource_vsphere_virtual_machine_class_test.go:53:9: S1039: unnecessary use of fmt.Sprintf (staticcheck)
        return fmt.Sprintf(`

2 issues:
* staticcheck: 2

After:

~/Downloads/terraform-provider-vsphere git:[fix/staticcheck-S1039]
golangci-lint run
0 issues.

[github-actions]

This functionality has been released in v2.13.0 of the Terraform Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!