update indexmap

Cargo.toml

@@ -30,6 +30,7 @@ glsl-out = []
 msl-out = []
 serialize = ["serde", "indexmap/serde-1"]
 deserialize = ["serde", "indexmap/serde-1"]
+arbitrary = ["dep:arbitrary", "indexmap/arbitrary"]
 spv-in = ["petgraph", "spirv"]
 spv-out = ["spirv"]
 wgsl-in = ["codespan-reporting", "hexf-parse", "termcolor", "unicode-xid"]
@@ -52,7 +53,7 @@ termcolor = { version = "1.0.4", optional = true }
 # https://github.com/brendanzab/codespan/commit/e99c867339a877731437e7ee6a903a3d03b5439e
 codespan-reporting = { version = "0.11.0", optional = true }
 rustc-hash = "1.1.0"
-indexmap = { version = "1.6", features = ["std"] }
+indexmap = { version = "1.9.2", features = ["std"] }
 log = "0.4"
 num-traits = "0.2"
 spirv = { version = "0.2", optional = true }