chore: fix devEngines declaration in root package

This change fixes the `devEngines` declaration in the root package to match the spec.  In npm 10.9.0 (released in October), a breaking change was introduced that checks the `devEngines` property, which causes `npm pack` calls to fail, due to the malformed `devEngines`.  The new declaration is also now aligned with the version of node specified in the repo's `.nvmrc`.  I can change it to be the more relaxed set of versions like it was before, but it seemed to make sense to have those be aligned.

Author: michaelfaith

package.json

@@ -107,7 +107,10 @@
     "yargs": "^15.3.1"
   },
   "devEngines": {
-    "node": "16.x || 18.x || 20.x || 22.x"
+    "runtime": {
+      "name": "node",
+      "version": "18.20.1"
+    }
   },
   "jest": {
     "testRegex": "/scripts/jest/dont-run-jest-directly\\.js$"