Bump rayon from 1.5.3 to 1.6.0 (#743)

Bumps [rayon](https://github.com/rayon-rs/rayon) from 1.5.3 to 1.6.0.
- [Release notes](https://github.com/rayon-rs/rayon/releases)
- [Changelog](https://github.com/rayon-rs/rayon/blob/master/RELEASES.md)
- [Commits](rayon-rs/rayon@v1.5.3...rayon-core-v1.6.0)

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

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.toml

@@ -25,7 +25,7 @@ fixedbitset = "0.4.2"
 numpy = "0.17.2"
 rand = "0.8"
 rand_pcg = "0.3"
-rayon = "1.5"
+rayon = "1.6"
 num-traits = "0.2"
 num-bigint = "0.4"
 num-complex = "0.4"

rustworkx-core/Cargo.toml

@@ -14,7 +14,7 @@ keywords = ["graph"]
 ahash = "0.8.0"
 fixedbitset = "0.4.2"
 petgraph = "0.6.2"
-rayon = "1.5"
+rayon = "1.6"
 num-traits = "0.2"
 priority-queue = "1.2"