fix(bindplane_configuration) Platform does not need to force a new resource

[jsirianni]

Description of Changes

The provider tries to delete and re-create a config when changing the platform. Currently there are no constraints here, we can just apply over the existing config to change its platform.

Testing

Make sure you have Goreleaser v2 installed.

Log into https://app.bindplane.com and create an API key.

1. Run make test-local to build the provider for local testing.
2. cd test/local
3. Update main.tf to use app.bindplane.com and an API key instead of basic auth.

provider "bindplane" {
  remote_url = "https://app.bindplane.com
  api_key = "YOUR API KEY"
}

Run terraform apply.

Edit main.tf and change the bindplane_configuration resource's platform from linux to windows. Re-run apply and observe that it changes the configuration instead of trying to delete and re-create.

Please check that the PR fulfills these requirements

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• CI passes