vscode-lldb: pin vsce version to fix build

pkgs/misc/vscode-extensions/vscode-lldb/build-deps/package.json

···
     "memory-streams": "^0.1.3",
     "vscode-debugprotocol": "^1.47.0",
     "vscode-debugadapter-testsupport": "^1.47.0",
-    "vsce": "^1.88.0",
+    "vsce": "=1.88.0",
     "webpack": "^5.37.1",
     "webpack-cli": "^4.7.0",
     "ts-loader": "^8.0.0"