Log Message:
{py-,}libxml2: update to 2.12.10

v2.12.10: Feb 18 2025

### Security

- [CVE-2025-24928] Fix stack-buffer-overflow in xmlSnprintfElements
- [CVE-2024-56171] Fix use-after-free after xmlSchemaItemListAdd
- pattern: Fix compilation of explicit child axis

### Regressions

- parser: Fix detection of duplicate attributes

### Bug fixes

- xpath: Fix parsing of non-ASCII names

### Portability

- python: Declare init func with PyMODINIT_FUNC
- tests: Fix sanitizer version check on old Apple clang

### Build

- autotools: Set AC_CONFIG_AUX_DIR
- cmake: Always build Python module as shared library
- cmake: Fix compatibility in package version file