[beta] DevTools 2.56.1 cherry-pick release

[elliette]

Rationale for cherry-pick:

DevTools freezes with "Memory access out of bounds" error on dart2wasm build. The underlying skwasm error has been fixed on Flutter stable, but in DevTools we need to update our pinned Flutter version to include the fix.

• DevTools issue: DevTools freezing with WASM build #9701
• Flutter issue: SKWasm renderer. Low-level Runtime Error. The interface blocked completely after 1-2 min on mobile Chrome flutter#182367

Component	Current	CP
DevTools Version	2.56.0	2.56.1
Flutter Version	N/A	3.42.0-0.4.pre
Flutter Commit	434491ab43cf63f27cf3a5fe8bc88aba12a4971b	9d59b38b5755777570b861e93be1e7c7f9913027

Full diff between the Flutter versions here:
flutter/flutter@434491a...3.42.0-0.4.pre

[elliette]

This has been completed, Flutter 3.43.0-0.2.pre includes the fix