incorporate changes (#7)

* (doc) Fix typo in comment

* (tests) Run phpcs/phan via GitHub Actions

* (1.43) Replace deprecated wfGetDB()

* (1.43) Replace removed method User::getGroups()

* (1.43) Replace nonexistent method ParserOutput::getRootText()

* (1.43) Replace deprecated WikiPage::factory()

* (1.43) Fix phan warning caused by incorrect type annotation

* (1.43) Fix "undeclared class LinksUpdate" (class was renamed)

* (phan) Fix "unused parameter" warnings

* (1.43) Replace deprecated ContentHandler::getContentText()

* (1.43) Replace deprecated ParserOutput::getText()

* (1.43) Replace deprecated Status::getHTML()

* Fix incorrect check of $wgAdminCanReadAll

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Co-authored-by: Edward Chernenko <[email protected]>