build(deps): bump petgraph from 0.6.6 to 0.7.0

Bumps [petgraph](https://github.com/petgraph/petgraph) from 0.6.6 to 0.7.0.
- [Changelog](https://github.com/petgraph/petgraph/blob/master/RELEASES.rst)
- [Commits](https://github.com/petgraph/petgraph/compare/petgraph@v0.6.6...petgraph@v0.7.0)

---
updated-dependencies:
- dependency-name: petgraph
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

aoc2023/Cargo.toml

@@ -21,7 +21,7 @@ itertools = { version = "0.13" }
 num = { version = "0.4" }
 num-integer = { version = "0.1" }
 pathfinding = { version = "4.13" }
-petgraph = { version = "0.6" }
+petgraph = { version = "0.7" }
 rayon = { version = "1.8" }
 rustc-hash = { version = "2.0" }
 rustworkx-core = { version = "0.15" }