Bump indexmap from 2.2.5 to 2.2.6 (#753)

Bumps [indexmap](https://github.com/indexmap-rs/indexmap) from 2.2.5 to 2.2.6.
- [Changelog](https://github.com/indexmap-rs/indexmap/blob/master/RELEASES.md)
- [Commits](https://github.com/indexmap-rs/indexmap/compare/2.2.5...2.2.6)

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

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

Cargo.lock

@@ -1021,9 +1021,9 @@ dependencies = [
 
 [[package]]
 name = "indexmap"
-version = "2.2.5"
+version = "2.2.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b0b929d511467233429c45a44ac1dcaa21ba0f5ba11e4879e6ed28ddb4f9df4"
+checksum = "168fb715dda47215e360912c096649d23d58bf392ac62f73919e831745e40f26"
 dependencies = [
  "equivalent",
  "hashbrown",

progenitor-impl/Cargo.toml

@@ -11,7 +11,7 @@ readme = "../README.md"
 heck = "0.4.1"
 http = "0.2.9"
 getopts = "0.2"
-indexmap = "2.2.5"
+indexmap = "2.2.6"
 openapiv3 = "2.0.0"
 proc-macro2 = "1.0"
 quote = "1.0"