refactor: Remove dead code from MySQLi Connection related to PHP 5 (#9887)

* Remove dead code

* Update PHPStan baselines

Author: kamil-tekiela

system/Database/MySQLi/Connection.php

@@ -207,21 +207,6 @@ public function connect(bool $persistent = false)
                 $socket,
                 $clientFlags,
             )) {
-                // Prior to version 5.7.3, MySQL silently downgrades to an unencrypted connection if SSL setup fails
-                if (($clientFlags & MYSQLI_CLIENT_SSL) !== 0 && version_compare($this->mysqli->client_info, 'mysqlnd 5.7.3', '<=')
-                    && empty($this->mysqli->query("SHOW STATUS LIKE 'ssl_cipher'")->fetch_object()->Value)
-                ) {
-                    $this->mysqli->close();
-                    $message = 'MySQLi was configured for an SSL connection, but got an unencrypted connection instead!';
-                    log_message('error', $message);
-
-                    if ($this->DBDebug) {
-                        throw new DatabaseException($message);
-                    }
-
-                    return false;
-                }
-
                 if (! $this->mysqli->set_charset($this->charset)) {
                     log_message('error', "Database: Unable to set the configured connection charset ('{$this->charset}').");
 

utils/phpstan-baseline/empty.notAllowed.neon

@@ -1,4 +1,4 @@
-# total 237 errors
+# total 236 errors
 
 parameters:
     ignoreErrors:
@@ -74,7 +74,7 @@ parameters:
 
         -
             message: '#^Construct empty\(\) is not allowed\. Use more strict comparison\.$#'
-            count: 11
+            count: 10
             path: ../../system/Database/MySQLi/Connection.php
 
         -

utils/phpstan-baseline/loader.neon

@@ -1,4 +1,4 @@
-# total 2772 errors
+# total 2771 errors
 
 includes:
     - argument.type.neon