Fix missing import

Author: asgerf

extensions/ql-vscode/src/common/jsonl-reader.ts

@@ -1,5 +1,6 @@
 import { stat } from "fs/promises";
 import { createReadStream } from "fs-extra";
+import type { BaseLogger } from "./logging";
 
 const doubleLineBreakRegexp = /\n\r?\n/;