Build(deps): Update peg requirement from 0.5 to 0.7
Build(deps): Update peg requirement from 0.5 to 0.7

Updates the requirements on [peg](https://github.com/kevinmehall/rust-peg) to permit the latest version.
- [Release notes](https://github.com/kevinmehall/rust-peg/releases)
- [Commits](https://github.com/kevinmehall/rust-peg/compare/0.5.0...0.7.0)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
gears-project/gears-core-rust,gears-project/gears-core-rust,gears-project/gears-core-rust