v2.13.2: Jul 4 2024

### Regressions

- tree: Fix handling of empty strings in xmlNodeParseContent
- valid: Restore ID lookup
- parser: Reenable ctxt->directory
- uri: Handle filesystem paths in xmlBuildRelativeURISafe
- encoding: Make xmlFindCharEncodingHandler return UTF-8 handler
- encoding: Fix encoding lookup with xmlOpenCharEncodingHandler
- include: Define ATTRIBUTE_UNUSED for clang
- uri: Fix xmlBuildURI with NULL base

### Improvements

- uri: Enable Windows paths on Cygwin
- tests: Clarify licence of test/intsubset2.xml