build(deps): bump indexmap from 2.5.0 to 2.6.0 (#270)

Bumps [indexmap](https://github.com/indexmap-rs/indexmap) from 2.5.0 to 2.6.0.
- [Changelog](https://github.com/indexmap-rs/indexmap/blob/master/RELEASES.md)
- [Commits](indexmap-rs/indexmap@2.5.0...2.6.0)

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

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

Author: dependabot[bot]

Cargo.lock

@@ -23,7 +23,7 @@ include = ["Cargo.toml", "LICENSE", "README.md", "src/**", "tests/**", "examples
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-indexmap = "2.5.0"
+indexmap = "2.6.0"
 log = "0.4.22" # for debug logs in tests
 priority-queue = "2.1.1"
 rustc-hash = ">=1.0.0, <3.0.0"