Ensure we always use the timezonedb extension from PECL

That way, on rebuild, the latest version will be always used,
instead of the one coming upstream that can be older.

Part of https://tracker.moodle.org/browse/MDL-76675

Author: stronk7

root/tmp/setup/php-extensions.sh

@@ -63,9 +63,9 @@ docker-php-ext-install -j$(nproc) gd
 docker-php-ext-configure ldap
 docker-php-ext-install -j$(nproc) ldap
 
-# APCu, igbinary, Memcached, MongoDB, Redis, Solr, uuid, XMLRPC (beta)
-pecl install apcu igbinary memcached mongodb pcov redis solr uuid xmlrpc-beta
-docker-php-ext-enable apcu igbinary memcached mongodb pcov redis solr uuid xmlrpc
+# APCu, igbinary, Memcached, MongoDB, PCov, Redis, Solr, timezonedb, uuid, XMLRPC (beta)
+pecl install apcu igbinary memcached mongodb pcov redis solr timezonedb uuid xmlrpc-beta
+docker-php-ext-enable apcu igbinary memcached mongodb pcov redis solr timezonedb uuid xmlrpc
 
 echo 'apc.enable_cli = On' >> /usr/local/etc/php/conf.d/docker-php-ext-apcu.ini