Bump linuxbrew/Homebrew from `b9550e2` to `6c68e4b`
Bump linuxbrew/Homebrew from `b9550e2` to `6c68e4b`

Bumps [linuxbrew/Homebrew](https://github.com/Homebrew/brew) from `b9550e2` to `6c68e4b`.
- [Release notes](https://github.com/Homebrew/brew/releases)
- [Commits](https://github.com/Homebrew/brew/compare/b9550e25a6be4559504ae28f48a2a564f48ae25a...6c68e4bcb98fb8ffaeca065721763f7683228925)

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