main/libxslt: upgrade to 1.1.39

https://gitlab.gnome.org/GNOME/libxslt/-/compare/v1.1.38...v1.1.39 -> code change lgtm

Changelog

v1.1.39: Nov 16 2023

### Bug fixes

- extensions: Don't search imports for extension prefixes

### Improvements

- transform: Check maximum depth when processing default templates
- build: Add more missing includes
- python: Don't set deprecated global
- build: Add missing includes
- imports: Limit nesting depth
- extensions: Report top-level elements in xsltDebugDumpExtensions
- Add extern "C" { } block to xsltlocale.h (David Kilzer)

### Portability

- python: Make it compatible with python3.12 (Daniel Garcia Moreno)
- date: Fix check for localtime_s
- date: Fix check for gmtime_s

### Build systems

- pkg-config files include cflags for static builds (Mike Dalessio)
- Handle NOCONFIG case when setting locations from CMake target properties (Markus
  Rickert)
- autotools: Make xslt-config executable

### Tests

- tests: Structured error handler now passes a const xmlError
- python: Fix tests on MinGW
- fuzz: Fix xmlFuzzEntityLoader after recent libxml2 changes

https://gitlab.gnome.org/GNOME/libxslt/-/blob/743ab691bed98ed11ac99bbd9d903d59fb814ab8/NEWS