deps: Bump indexmap to 2.0 (#22567)

Closes #ISSUE

Release Notes:

- N/A

crates/theme/Cargo.toml

@@ -28,7 +28,7 @@ log.workspace = true
 palette = { workspace = true, default-features = false, features = ["std"] }
 parking_lot.workspace = true
 refineable.workspace = true
-schemars = { workspace = true, features = ["indexmap"] }
+schemars = { workspace = true, features = ["indexmap2"] }
 serde.workspace = true
 serde_derive.workspace = true
 serde_json.workspace = true

crates/theme_importer/Cargo.toml

@@ -16,7 +16,7 @@ indexmap.workspace = true
 log.workspace = true
 palette.workspace = true
 rust-embed.workspace = true
-schemars = { workspace = true, features = ["indexmap"] }
+schemars = { workspace = true, features = ["indexmap2"] }
 serde.workspace = true
 serde_json.workspace = true
 serde_json_lenient.workspace = true