Bump const_fn from 0.4.3 to 0.4.4
Bump const_fn from 0.4.3 to 0.4.4

Bumps [const_fn](https://github.com/taiki-e/const_fn) from 0.4.3 to 0.4.4.
- [Release notes](https://github.com/taiki-e/const_fn/releases)
- [Changelog](https://github.com/taiki-e/const_fn/blob/master/CHANGELOG.md)
- [Commits](https://github.com/taiki-e/const_fn/compare/v0.4.3...v0.4.4)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
shssoichiro/oxipng,shssoichiro/oxipng,shssoichiro/oxipng