Incomplete fix for CVE-2022-31625

The upstream fix for CVE-2022-31625 is the following patch: https://github.com/php/php-src/commit/55f6895f4b4c677272fd4ee1113acdbd99c4b5ab

Upstream applied it for php7.4, php8.0 and php8.1, all of them have a pretty similar code for 'ext/pgsql/pgsql.c'.

In php7.2, the code is slight different and I believe the fix suggested in the patch should be applied in some other methods.
Mainly, the fix is to apply the following where we have calls to safe_emalloc() for params:

  - _php_pgsql_free_params(params, num_params);
  + _php_pgsql_free_params(params, i);

and we have this code for the following methods in php7.2:
  pg_query_params
  pg_execute
  pg_send_query_params
  pg_send_execute

the version '7.2.24-0ubuntu0.18.04.12' in bionic is only including the fix in 'pg_query_params'.

as suggested in the upstream bug: https://bugs.php.net/bug.php?id=81720:
 "There are other functions where you use basically the same code (if cannot convert to string,
  then free all params) so it might be worth a look."

I think we should be including in the other methods listed above for php7.2