fix(deps): update dependency vega to v6 [security]

Author: renovate[bot]

package.json

@@ -2541,7 +2541,7 @@
         "tmp": "^0.2.4",
         "url-parse": "^1.5.10",
         "uuid": "^13.0.0",
-        "vega": "^5.33.0",
+        "vega": "^6.0.0",
         "vega-embed": "^6.25.0",
         "vega-lite": "^5.21.0",
         "vscode-debugprotocol": "^1.41.0",