deprecated code

[Zweihorn]

Issue Description

After an installation on Release 2024-02-06a "Kaos" together with current sprintdoc template and regular access to the wiki this plug-in produces a plethora of deprecated warnings in log like:

helper_plugin_sqlite::init() is deprecated. It was called from helper_plugin_do::__construct() in .../dokuwiki/lib/plugins/do/helper.php:32 dokuwiki\plugin\sqlite\SQLiteDB should be used instead!

utf8_strtolower() is deprecated. It was called from helper_plugin_do::loadTasks() in .../dokuwiki/lib/plugins/do/helper.php:140 dokuwiki\Utf8\PhpString::strtolower() should be used instead!

resolve_pageid() is deprecated. It was called from helper_plugin_do::loadTasks() in .../dokuwiki/lib/plugins/do/helper.php:135 dokuwiki\File\PageResolver should be used instead!

I'd call this rather unfortunate and quite annoying to the SysAdm.

However, I appreciate the nice integration between this do plug-in and the sprintdoc template.

Keep on the good work and prosper.

🌻