Update Rust crate indexmap to 2.9.0 (#8117)

Author: oxide-renovate[bot]

Cargo.toml

@@ -476,7 +476,7 @@ id-map = { path = "id-map" }
 illumos-utils = { path = "illumos-utils" }
 iana-time-zone = "0.1.63"
 indent_write = "2.2.0"
-indexmap = "2.7.1"
+indexmap = "2.9.0"
 indicatif = { version = "0.17.11", features = ["rayon"] }
 indoc = "2.0.6"
 installinator = { path = "installinator" }