libxml2: Update to version 2.11.4

libxml2: Update to version 2.11.4

- Update from version 2.11.1 to 2.11.4
- Update of rootfile
- Changelog
    v2.11.4: May 18 2023
	Fixes a serious regression.
		- parser: Fix regression when push parsing UTF-8 sequences
    v2.11.3: May 11 2023
	Fixes more regressions.
		- xinclude: Fix false positives in inclusion loop detection
		- autotools: Fix ICU detection
		- parser: Fix "huge input lookup" error with push parser
		- xpath: Fix build without LIBXML_XPATH_ENABLED
		- hash: Fix possible startup crash with old libxslt versions
		- autoconf: fix iconv library paths (Mike Dalessio)
    v2.11.2: May 5 2023
	Fix regressions.
		- threads: Fix startup crash with weak symbol hack
		- win32: Don't depend on removed .def file
		- schemas: Fix memory leak in xmlSchemaValidateStream

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>