Bump @types/node from 15.9.0 to 15.12.1 (#626)

Bumps [@types/node](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/node) from 15.9.0 to 15.12.1.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/node)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

package-lock.json

@@ -38,7 +38,7 @@
     "@rollup/plugin-typescript": "^8.2.1",
     "@tsconfig/svelte": "^2.0.1",
     "@types/express": "^4.17.11",
-    "@types/node": "^15.9.0",
+    "@types/node": "^15.12.1",
     "esbuild": "^0.12.1",
     "npm-run-all": "^4.1.5",
     "postcss": "8.3.0",