Bump node-abi from 2.20.0 to 2.21.0 in /app

Bumps [node-abi](https://github.com/lgeiger/node-abi) from 2.20.0 to 2.21.0.
- [Release notes](https://github.com/lgeiger/node-abi/releases)
- [Commits](https://github.com/lgeiger/node-abi/compare/v2.20.0...v2.21.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

app/package.json

@@ -50,7 +50,7 @@
   "devDependencies": {
     "@types/mz": "0.0.32",
     "@types/node": "14.14.31",
-    "node-abi": "^2.19.3",
+    "node-abi": "^2.21.0",
     "source-map-support": "^0.5.19"
   },
   "peerDependencies": {