out_bigquery: Switch to a more modern OAuth2 token URL.
#define FLB_BIGQUERY_SCOPE "https://www.googleapis.com/auth/bigquery.insertdata"
/* BigQuery authorization URL */
-#define FLB_BIGQUERY_AUTH_URL "https://www.googleapis.com/oauth2/v4/token"
+#define FLB_BIGQUERY_AUTH_URL "https://oauth2.googleapis.com/token"
#define FLB_BIGQUERY_RESOURCE_TEMPLATE "/bigquery/v2/projects/%s/datasets/%s/tables/%s/insertAll"
#define FLB_BIGQUERY_URL_BASE "https://www.googleapis.com"
