build(deps-dev): bump @types/node from 12.6.9 to 15.0.2

Bumps [@types/node](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/node) from 12.6.9 to 15.0.2.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/node)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -29,7 +29,7 @@
   "devDependencies": {
     "@actions/io": "^1.1.0",
     "@types/jest": "^26.0.23",
-    "@types/node": "^12.0.4",
+    "@types/node": "^15.0.2",
     "@types/semver": "^7.3.5",
     "@typescript-eslint/eslint-plugin": "^4.22.1",
     "@typescript-eslint/parser": "^4.22.1",