Add dependency on `iter_fixed` to `fj-kernel`

Cargo.lock

@@ -1187,6 +1187,7 @@ dependencies = [
  "anyhow",
  "fj-interop",
  "fj-math",
+ "iter_fixed",
  "itertools",
  "parking_lot",
  "pretty_assertions",
@@ -1836,6 +1837,12 @@ version = "2.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f88c5561171189e69df9d98bcf18fd5f9558300f7ea7b801eb8a0fd748bd8745"
 
+[[package]]
+name = "iter_fixed"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4d1d13810ef04ff22d946a8445d1e0016c9e98dbb6deeeb2af061e753060737c"
+
 [[package]]
 name = "itertools"
 version = "0.10.5"

crates/fj-kernel/Cargo.toml

@@ -13,6 +13,7 @@ categories.workspace = true
 [dependencies]
 fj-interop.workspace = true
 fj-math.workspace = true
+iter_fixed = "0.3.1"
 itertools = "0.10.5"
 parking_lot = "0.12.0"
 pretty_assertions = "1.3.0"