Switch vscode to stable for localization test (#1003)

Co-authored-by: Ezio Li <v-yukl@microsoft.com>

test/localization/runTest.ts

@@ -20,7 +20,7 @@ async function launchTests() {
             extensionDevelopmentPath,
             extensionTestsPath,
             launchArgs: ["--locale", "zh-cn"],
-            version: "1.91.1",
+            version: "stable",
         });
     } catch (err) {
         console.error(err);