Replace the deprecated pathspec gitwildmatch factory

[sabbaticas]

Closes #25.

Summary

• load_gitignore_patterns() now builds its .gitignore matcher from GitIgnoreSpecPattern instead of pathspec's deprecated 'gitwildmatch' name.
• Which files are ignored is unchanged.
• The pathspec floor moves from >=0.12.1 to >=1.0.0.
• The test suite's 168 deprecation warnings are gone.

Why not the obvious fix

The deprecation message says to use 'gitignore', and #25 proposed that swap. It changes which files are scanned:

Pattern	Before, and Git	With 'gitignore'
foo/*	Ignores everything under foo/, including foo/bar/baz.txt	Ignores only direct children; foo/bar/baz.txt is scanned
a bare /	Ignores nothing	Ignores every file

In pathspec 1.x the deprecated class is declared class GitWildMatchPattern(GitIgnoreSpecPattern) and adds only the warning. The registered 'gitignore' name maps to GitIgnoreBasicPattern, a different implementation that pathspec's own docstring says "differs from how Git actually behaves". Passing GitIgnoreSpecPattern directly is identical to the old behaviour by construction.

The floor change

GitIgnoreSpecPattern does not exist in pathspec 0.12.1 (ModuleNotFoundError). A fresh install already resolved to 1.x, requirements.txt pins 1.1.1, and kospex pins pathspec==1.1.1, so only an environment pinning pathspec below 1.0 is affected.

Testing

• pytest -W error::DeprecationWarning: 768 passed, on pathspec 1.1.1 and on 1.0.0, the new floor.
• Eleven new tests in TestLoadGitignorePatterns pin foo/*, the bare /, negation, directory patterns and the four literals panopticas appends. The deprecation test failed before the change. With 'gitignore' swapped in temporarily, the foo/* and bare / tests fail.
• identify_files() over this repository returns the same 113 files and filetypes before and after.
• Across 167 cloned repositories (237,318 files) the matcher was compared with git check-ignore: no root .gitignore pattern was interpreted differently. The structural differences that comparison found are unrelated to this change and are recorded in File selection differs from Git: tracked-but-ignored files, nested .gitignore, no .gitignore #46.

Not covered

Two malformed patterns (an invalid range such as a[b-a]c, and a lone backslash) make pathspec raise with every matcher, old and new. Existing behaviour, unchanged here.

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