Update `/.golangci.yml` to remove linters deprecated in v1.49.0

[tenthirtyam]

Code of Conduct

This project has a Code of Conduct that all participants are expected to understand and follow:

• [ ] I have read and agree to the project's Code of Conduct

Description

Consider removing the following deprecated golangci-lint linters which can be replaced with the existing unused:

• deadcode - deprecated since v1.49.0
• structcheck - deprecated since v1.49.0
• varcheck - deprecated since v1.49.0

https://github.com/vmware/terraform-provider-vra/blob/268eaeebf0ac5a715d1d7ec92e20c4552ab44cba/.golangci.yml#L8-L28

References

https://github.com/golangci/golangci-lint/issues/1841.

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[tenthirtyam]

cc @frodenas