Remove leftover references to removed credential_file arg

docs/index.md

@@ -106,8 +106,6 @@ connection "gcp" {
 }
 ```
 
-**NOTE:** The `credential_file` property has been deprecated and will be removed in the next major version. Please use `credentials` instead.
-
 ## Advanced configuration options
 
 By default, the GCP plugin uses your [Application Default Credentials](https://cloud.google.com/sdk/gcloud/reference/auth/application-default) to connect to GCP. If you have not set up ADC, simply run `gcloud auth application-default login`. This command will prompt you to log in, and then will download the application default credentials to ~/.config/gcloud/application_default_credentials.json.

gcp/utils.go

@@ -188,8 +188,6 @@ func setSessionConfig(ctx context.Context, connection *plugin.Connection) []opti
 	gcpConfig := GetConfig(connection)
 	opts := []option.ClientOption{}
 
-	// 'credential_file' in connection config is DEPRECATED, and will be removed in future release
-	// use `credentials` instead
 	if gcpConfig.Credentials != nil {
 		contents, err := pathOrContents(*gcpConfig.Credentials)
 		if err != nil {
@@ -420,13 +418,13 @@ var GcpFilterOperatorMap = map[string]string{
 }
 
 func extractLastPartSeparatedByBackslash(ctx context.Context, d *transform.TransformData) (interface{}, error) {
-	data :=types.SafeString(d.Value)
+	data := types.SafeString(d.Value)
 
 	if data == "" {
 		return nil, nil
 	}
 
 	splitStr := strings.Split(data, "/")
 
-	return splitStr[len(splitStr) - 1], nil
-}
+	return splitStr[len(splitStr)-1], nil
+}