libxml2: Update to version 2.14.2

libxml2: Update to version 2.14.2

- Update from version 2.14.0 to 2.14.2
- Update of rootfile
- Two CVE fixes in 2.14.2
- Changelog
    2.14.2
	### Security
		- [CVE-2025-32415] schemas: Fix heap buffer overflow in
		  xmlSchemaIDCFillNodeTables
		- [CVE-2025-32414] python: Read at most len/4 characters. (Maks Verver)
	### Build
		- error: Fix initGenericErrorDefaultFunc compatibility macro
		- meson: don't link with pthreads on Windows (Benjamin Gilbert)
		- cmake, meson: Align Darwin version info with Autotools
		- globals: Fix --with-thread-alloc build
		- meson: ensure relaxng option supports minimum option (Lovell Fuller)
    2.14.1
	### Regressions
		- parser: Fix XML_PARSE_NOBLANKS dropping non-whitespace text
	### Build systems
		- win32-legacy: Fix build (ThomasK)
		- meson: Fix build from tarball
		- cmake, meson: Change library filename to libxml2.so.16.0.0

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