Fixes #38115 - Drop Ruby 2.7 and NodeJS 14 support

We no longer have deployment targets with these versions and it's
holding back use of the latest libraries.

Author: ekohl

.github/matrix.json

@@ -1,5 +1,5 @@
 {
   "postgresql": ["13"],
-  "ruby": ["2.7", "3.0"],
-  "node": ["14", "18"]
+  "ruby": ["3.0"],
+  "node": ["18"]
 }

package.json

@@ -5,7 +5,7 @@
   "description": "Foreman isn't really a node module, these are just dependencies needed to build the webpack bundle. 'dependencies' are the asset libraries in use and 'devDependencies' are used for the build process.",
   "private": true,
   "engines": {
-    "node": ">=14.0.0 <21.0.0"
+    "node": ">=18.0.0 <21.0.0"
   },
   "scripts": {
     "lint": "tfm-lint",