Bump VS Code engine to 1.74.0-insiders (#20255)

Closes #20247

Author: brettcannon

package.json

@@ -41,7 +41,7 @@
         "theme": "dark"
     },
     "engines": {
-        "vscode": "^1.73.0"
+        "vscode": "^1.74.0-insiders"
     },
     "keywords": [
         "python",