chore(deps): bump % node.js@18

By the time we release the package, Gallium may
be end-of-life already. Let's continue the trend w/
all of the other packages & the `@types/node` req.

Signed-off-by: Derek Lewis <[email protected]>

Author: DerekNonGeneric

package.json

@@ -4,7 +4,7 @@
   "description": "Common Markdown table-related utilities",
   "packageManager": "[email protected]",
   "engines": {
-    "node": "^16.13.0"
+    "node": "^18.0.0"
   },
   "keywords": ["markdown", "json", "table", "utilities"],
   "repository": "OpenINF/openinf-util-md-table",