[naga]: Remove unused features from petgraph

[bushrat011899]

Connections

• Contributes to Support no_std where possible (specifically for wasm32v1-none) #6826

Description

• Remove unused features from petgraph in Naga, improving no_std compatibility

Testing

• CI

Squash or Rebase?

Squash

Checklist

• Run cargo fmt. N/A
• Run taplo format.
• Run cargo clippy --tests. If applicable, add:
  • --target wasm32-unknown-unknown
• Run cargo xtask test to run tests.
• If this contains user-facing changes, add a CHANGELOG.md entry. N/A

[bushrat011899]

I believe this CI failure is spurious.

[ErichDonGubler]

Mostly LGTM, but there's a blocking concern with the choice of hasher I want to validate first.