chore(deps): update rust crate indexmap to v2

Author: renovate[bot]

Cargo.lock

@@ -41,7 +41,7 @@ anyhow = "~1.0.71"
 thiserror = "~1.0.40"
 pyo3 = { version = "~0.19.0", features = ["auto-initialize"] }
 egui = { version = "0.22.0", optional = true }
-indexmap = { version = "1.9.3", optional = true }
+indexmap = { version = "2.0.2", optional = true }
 eframe = { version = "0.22.0", optional = true }
 rfd = { version = "0.11.4", optional = true }
 boolector-solver = { package = "boolector", version = "~0.4.3", features = ["vendor-lgl"], optional = true }