Update references to resource for PHP8.1

[GuySartorelli]

PHP8.1 uses concrete classes where resources used to be used. e.g. PgSql\Result replaces the result resource, and PgSql\Connection replaces the connection resource.

Acceptance criteria

• The CMS 4 compatible version checks for resource || concrete classes
• The CMS 5 version explicitly does not reference resources at all where concrete classes should be used.

PRs

• TBD (CMS 4)
• FIX Reference concrete class names for PHP 8.1 #142 (CMS 5)