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"]
 }