Update html-admin-page-status-report.php

Use `$wpdb->db_version()` instead of `mysql_get_server_info()` deprecated in PHP 5.5

includes/admin/views/html-admin-page-status-report.php

@@ -47,7 +47,13 @@
 		</tr>
 		<tr>
 			<td><?php _e( 'MySQL Version','woocommerce' ); ?>:</td>
-			<td><?php if ( function_exists( 'mysql_get_server_info' ) ) echo esc_html( mysql_get_server_info() ); ?></td>
+			<td>
+				<?php
+				/** @global wpdb $wpdb */
+				global $wpdb;
+				echo $wpdb->db_version();
+				?>
+			</td>
 		</tr>
 		<tr>
 			<td><?php _e( 'WP Memory Limit','woocommerce' ); ?>:</td>