Panpdf

What's Changed
* Cache citation by daizutabi in https://github.com/daizutabi/panpdf/pull/67
* Add font.ipynb by daizutabi in https://github.com/daizutabi/panpdf/pull/69
* Search fonts from LaTeX directories by daizutabi in https://github.com/daizutabi/panpdf/pull/70


**Full Changelog**: https://github.com/daizutabi/panpdf/compare/0.3.8...0.3.9

What's Changed
* Update ruff rules by daizutabi in https://github.com/daizutabi/panpdf/pull/63


**Full Changelog**: https://github.com/daizutabi/panpdf/compare/0.3.7...0.3.8

**Full Changelog**: https://github.com/daizutabi/panpdf/compare/0.3.6...0.3.7

**Full Changelog**: https://github.com/daizutabi/panpdf/compare/0.3.5...0.3.6

**Full Changelog**: https://github.com/daizutabi/panpdf/compare/0.3.4...0.3.5