chore: stop depending on itertools

Cargo.lock

@@ -1518,7 +1518,6 @@ dependencies = [
  "icu_collator",
  "icu_provider 1.5.0",
  "indexmap",
- "itertools 0.14.0",
  "lazy_static",
  "libcosmic",
  "log",
@@ -3897,15 +3896,6 @@ dependencies = [
  "either",
 ]
 
-[[package]]
-name = "itertools"
-version = "0.14.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2b192c782037fadd9cfa75548310488aabdbf3d2da73885b31bd0abd03351285"
-dependencies = [
- "either",
-]
-
 [[package]]
 name = "itoa"
 version = "1.0.15"
@@ -5706,7 +5696,7 @@ dependencies = [
  "built",
  "cfg-if",
  "interpolate_name",
- "itertools 0.12.1",
+ "itertools",
  "libc",
  "libfuzzer-sys",
  "log",