fix(load): satisfy @types/node peer dependency for cosmiconfig-loader-typescript (conventional-changelog#3008)

Add @types/node as a dependency of @commitlint/load to satisfy peer dependency from
cosmiconfig-loader-typescript (by way of ts-node's peer dependency of the same)

Fixes conventional-changelog#3007

Author: jrolfs

@commitlint/load/package.json

@@ -46,6 +46,7 @@
     "@commitlint/execute-rule": "^16.0.0",
     "@commitlint/resolve-extends": "^16.1.0",
     "@commitlint/types": "^16.0.0",
+    "@types/node": ">=12",
     "chalk": "^4.0.0",
     "cosmiconfig": "^7.0.0",
     "cosmiconfig-typescript-loader": "^1.0.0",