Update itertools requirement from 0.10 to 0.13 in /task-maker-exec

Updates the requirements on [itertools](https://github.com/rust-itertools/itertools) to permit the latest version.
- [Changelog](https://github.com/rust-itertools/itertools/blob/master/CHANGELOG.md)
- [Commits](rust-itertools/itertools@v0.10.0...v0.13.0)

---
updated-dependencies:
- dependency-name: itertools
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

task-maker-exec/Cargo.toml

@@ -25,7 +25,7 @@ tempfile = "3.3"
 # Resolve executable names in $PATH
 which = "4.2"
 # General iterator utilities
-itertools = "0.10"
+itertools = "0.13"
 # defer! macro
 scopeguard = "1.0"
 # Sandbox