fix(terraform): keep prior state when the proxy rejects a virtual key update

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

terraform/provider/litellm/resource_key.go

@@ -327,6 +327,7 @@ func resourceKeyUpdate(ctx context.Context, d *schema.ResourceData, m interface{
 	key.Metadata = metadata
 
 	if _, err := c.UpdateKey(key); err != nil {
+		d.Partial(true)
 		return diag.FromErr(fmt.Errorf("error updating key: %s", err))
 	}