chore(core): aligning core engine requirement with main ionic-framework requirement (#30869)

Issue number: resolves #30868

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## What is the current behavior?

Currently, users are unable to use ionic-framework with node < 24. This
was an accidental change, not something we actually require.

## What is the new behavior?

This change aligns the core file with the [top level
package.json](https://github.com/ionic-team/ionic-framework/blob/main/package.json#L9)
requirement. We may want to look into upping this at some point in the
future, but right now this should be fine.

## Does this introduce a breaking change?

- [ ] Yes
- [X] No

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## Other information

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screenshots of how the component looks before and after the change. -->

Author: ShaneK

core/package-lock.json

@@ -3,7 +3,7 @@
   "version": "8.7.12",
   "description": "Base components for Ionic",
   "engines": {
-    "node": "24.x"
+    "node": ">= 16"
   },
   "keywords": [
     "ionic",