Use options object instead of boolean for mergeResults

lib/codeql.js

@@ -665,7 +665,7 @@ async function getCodeQLForCmd(cmd, checkVersion) {
             }).exec();
             return JSON.parse(extractorPath);
         },
-        async mergeResults(sarifFiles, outputFile, mergeRunsFromEqualCategory = false) {
+        async mergeResults(sarifFiles, outputFile, { mergeRunsFromEqualCategory = false, }) {
             const args = [
                 "github",
                 "merge-results",