packaging 26.2 release notes

Fixes:

Fix incorrect sysconfig var name for pyemscripten by @ryanking13 in https://github.com/pypa/packaging/pull/1160
Make Version, Specifier, SpecifierSet, Tag, Marker, and Requirement pickle-safe and backward-compatible with pickles created in 25.0-26.1 (including references to the removed packaging._structures module) by @eachimei and @henryiii in https://github.com/pypa/packaging/pull/1163, https://github.com/pypa/packaging/pull/1168, https://github.com/pypa/packaging/pull/1170, and https://github.com/pypa/packaging/pull/1171
fix: re-export ExceptionGroup for now by @henryiii in https://github.com/pypa/packaging/pull/1164

Documentation:

docs: add errors section and fix missing details by @henryiii in https://github.com/pypa/packaging/pull/1159
docs(dev): document property-based test suite by @r266-tech in https://github.com/pypa/packaging/pull/1167
Fix typo in DirectUrl documentation by @sbidoul in https://github.com/pypa/packaging/pull/1169
docs(specifiers): add is_unsatisfiable() usage example by @r266-tech in https://github.com/pypa/packaging/pull/1166

Internal:

Enable the auditor persona on zizmor by @henryiii in https://github.com/pypa/packaging/pull/1158
Test new pickle guarantees by @henryiii in https://github.com/pypa/packaging/pull/1174
Use native uv integration in rtd by @henryiii in https://github.com/pypa/packaging/pull/1175

@ryanking13 made their first contribution in https://github.com/pypa/packaging/pull/1160
@eachimei made their first contribution in https://github.com/pypa/packaging/pull/1163

Full Changelog: https://github.com/pypa/packaging/compare/26.1...26.2

packaging 26.2