Add Python 3.13 support and update dependencies

[EndlessTrax]

• Update all dependencies
• Fix type hint errors
• Fix pytest warning
• Add python 3.13 to supported versions
• Bump version

[Copilot]

Pull Request Overview

This PR adds support for Python 3.13, bumps the package version, and updates type hints and dependency workflows.

• Bump version to 0.8.1 and add Python 3.13 classifier in pyproject.toml
• Fix type hints in link_checker.py and tighten exception handling
• Update CLI return annotation and parser features
• Extend CI and release workflows to include Python 3.13

Reviewed Changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
pyproject.toml	Bump version and add Python 3.13 to supported versions
pyanchor/link_checker.py	Replace re import with Optional, adjust method signature, add None guard, tighten exception clause
pyanchor/cli.py	Change print_results return annotation and update parser feature to lxml-xml
.github/workflows/run_tests.yml	Include Python 3.13 in test matrix
.github/workflows/release.yml	Install Python 3.13 in release workflow

Comments suppressed due to low confidence (1)

pyanchor/cli.py:11

• The function signature now returns a generic tuple, but the docstring still implies an int return. Please update the docstring to describe the actual return structure and consider using a more specific type annotation (e.g., tuple[int, int]).

def print_results(links: dict, verbose: bool) -> tuple: