Bump indexmap from 2.1.0 to 2.2.1 (#704)

Bumps [indexmap](https://github.com/indexmap-rs/indexmap) from 2.1.0 to 2.2.1.
- [Changelog](https://github.com/indexmap-rs/indexmap/blob/master/RELEASES.md)
- [Commits](https://github.com/indexmap-rs/indexmap/compare/2.1.0...2.2.1)

---
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>

Cargo.lock

@@ -1007,9 +1007,9 @@ dependencies = [
 
 [[package]]
 name = "indexmap"
-version = "2.1.0"
+version = "2.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d530e1a18b1cb4c484e6e34556a0d948706958449fca0cab753d649f2bce3d1f"
+checksum = "433de089bd45971eecf4668ee0ee8f4cec17db4f8bd8f7bc3197a6ce37aa7d9b"
 dependencies = [
  "equivalent",
  "hashbrown 0.14.1",

progenitor-impl/Cargo.toml

@@ -11,7 +11,7 @@ readme = "../README.md"
 heck = "0.4.1"
 http = "0.2.9"
 getopts = "0.2"
-indexmap = "2.1.0"
+indexmap = "2.2.1"
 openapiv3 = "2.0.0"
 proc-macro2 = "1.0"
 quote = "1.0"