v42.3.0

Full changelog

• Rust
  • BUGFIX: Correct category & name for preinit_tasks_overflow metric. Previously it would have been wrongly recorded as preinit_tasks_overflow.glean.error (#1887)
  • BUGFIX: Fix to name given to the events ping when instantiated (#1885)
• iOS
  • BUGFIX: Make fields of RecordedEventData publicly accessible (#1867)
  • Skip code generation in indexbuild build (#1889)
• Python
  • Don't let environment affect subprocess module search path (#1542)