downgrade indexmap to get rid of extra hashbrown dependency

Cargo.lock

@@ -1931,7 +1931,7 @@ checksum = "9c08c1f623a8d0b722b8b99f821eb0ba672a1618f0d3b16ddbee1cedd2dd8557"
 dependencies = [
  "bitflags 2.6.0",
  "gpu-descriptor-types",
- "hashbrown 0.14.3",
+ "hashbrown",
 ]
 
 [[package]]
@@ -1977,12 +1977,6 @@ dependencies = [
  "allocator-api2",
 ]
 
-[[package]]
-name = "hashbrown"
-version = "0.15.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1e087f84d4f86bf4b218b927129862374b72199ae7d8657835f1e89000eea4fb"
-
 [[package]]
 name = "heck"
 version = "0.5.0"
@@ -2124,12 +2118,12 @@ dependencies = [
 
 [[package]]
 name = "indexmap"
-version = "2.6.0"
+version = "2.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "707907fe3c25f5424cce2cb7e1cbcafee6bdbe735ca90ef77c29e84591e5b9da"
+checksum = "68b900aa2f7301e21c36462b170ee99994de34dff39a4a6a528e80e7376d07e5"
 dependencies = [
  "equivalent",
- "hashbrown 0.15.0",
+ "hashbrown",
 ]
 
 [[package]]