Pugixml

Maintenance release.

- **Changed**
- Update pybind11 from 2.11.1 to 2.12.0
- **Fixed**
- Fix problems with macOS builds ([82](https://github.com/miute/pugixml-python/pull/82), [#85](https://github.com/miute/pugixml-python/pull/85))
- **Removed**
- Drop support for macOS 11
- Drop support for Python 3.7

- **New**
- Add support for Python 3.12
- Add support for pugixml 1.14
- Add `pugixml.pugi.PARSE_MERGE_PCDATA`
- Add `pugixml.pugi.XMLAttribute.set_name(name: str, size: int)`
- Add `pugixml.pugi.XMLNode.set_name(name: str, size: int)`
- **Changed**
- Update pybind11 from 2.10.1 to 2.11.1
- **Fixed**
- Remove unnecessary length check:
- `pugixml.pugi.XMLAttribute.set_value(value: str, size: int)`
- `pugixml.pugi.XMLNode.set_value(value: str, size: int)`
- `pugixml.pugi.XMLText.set(value: str, size: int)`

- **New**
- Add support for pugixml 1.13
- Add `pugixml.pugi.XMLAttribute.set_value(value: str, size: int)`
- Add `pugixml.pugi.XMLNode.set_value(value: str, size: int)`
- Add `pugixml.pugi.XMLText.set(value: str, size: int)`
- **Changed**
- Update pybind11 from 2.10.0 to 2.10.1
- **Improved**
- Improve type checking

- **New**
- Add support for Python 3.11
- Add `pugixml.pugi.BytesWriter` class
- Add `pugixml.pugi.FileWriter` class
- Add `pugixml.pugi.limits` submodule
- **Added**
- Add `pugixml.pugi.StringWriter.__len__()`
- **Changed**
- Update pugixml from 1.12 to [521b2cd](https://github.com/zeux/pugixml/tree/521b2cd854f8d65f173107d056d2b9c6d49b6563)
- Update pybind11 from 2.9.2 to 2.10.0
- **Fixed**
- Fix `pugixml.pugi.PrintWriter` to raise an exception when encoding fails
- **Improved**
- Update docstring
- Change arguments of `pugixml.pugi.StringWriter.getvalue()` → `getvalue(encoding: str = 'utf-8', errors: str = 'strict')`

- **New**
- Add `pugixml.pugi.XMLAttributeStruct` class
- Add `pugixml.pugi.XMLNodeStruct` class
- Add `pugixml.pugi.XMLAttributeIterator` class
- Add `pugixml.pugi.XMLNodeIterator` class
- Add `pugixml.pugi.XMLNamedNodeIterator` class
- **Added**
- Add `pugixml.pugi.XMLAttribute.internal_object()`
- Add `pugixml.pugi.XMLAttribute.__init__(p: XMLAttributeStruct)`
- Add `pugixml.pugi.XMLNode.internal_object()`
- Add `pugixml.pugi.XMLNode.__init__(p: XMLNodeStruct)`
- **Fixed**
- Change return type of `pugixml.pugi.XMLNode.attributes() -> List[XMLAttribute]` → `XMLAttributeIterator`
- Change return type of `pugixml.pugi.XMLNode.children() -> List[XMLNode]` → `XMLNodeIterator`
- Change return type of `pugixml.pugi.XMLNode.children(name: str) -> List[XMLNode]` → `XMLNamedNodeIterator`

Initial release.