Update gifsicle requirement from ^3.0.0 to ^4.0.1
Update gifsicle requirement from ^3.0.0 to ^4.0.1

Updates the requirements on [gifsicle](https://github.com/imagemin/gifsicle-bin) to permit the latest version.
- [Release notes](https://github.com/imagemin/gifsicle-bin/releases)
- [Commits](https://github.com/imagemin/gifsicle-bin/compare/3.0.0...v4.0.1)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
oohnoitz/node-gifsicle-stream