Update itertools and allow itertools 0.10 too.

[emilio]

This can help avoid duplicate dependencies when using bindgen as a library.

[bobrik]

@emilio, this is somewhat annoying as it generates random bouncing when unrelated things are bumped:

diff --git a/Cargo.lock b/Cargo.lock
index 29c1f57f0..ac006628b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -791,7 +791,7 @@ dependencies = [
  "bitflags 2.9.1",
  "cexpr",
  "clang-sys",
- "itertools 0.13.0",
+ "itertools 0.10.5",
  "log",
  "prettyplease 0.2.35",
  "proc-macro2",
@@ -811,7 +811,7 @@ dependencies = [
  "bitflags 2.9.1",
  "cexpr",
  "clang-sys",
- "itertools 0.13.0",
+ "itertools 0.10.5",
  "log",
  "prettyplease 0.2.35",
  "proc-macro2",
@@ -831,7 +831,7 @@ dependencies = [
  "bitflags 2.9.1",
  "cexpr",
  "clang-sys",
- "itertools 0.13.0",
+ "itertools 0.10.5",
  "proc-macro2",
  "quote",
  "regex",
@@ -5218,12 +5218,11 @@ dependencies = [

Is there a better way to do this? Perhaps the answer is to remove itertools here altogether: #3086.

[emilio]

@bobrik Isn't that a cargo bug if so? It shouldn't downgrade things even if a transitive dependency has an older version of a library.

[bobrik]

Sure, it's likely a cargo bug. A quick search finds rust-lang/cargo#14115, rust-lang/cargo#5529, rust-lang/cargo#15513, and a bunch of linked issues, all of which with no sign of much progress. While it would be nice to fix the cargo bug, removing the trigger here seems like the next best thing.