Starknet 0.14.3 Adds Dynamic Fees, Faster Blocks

Starknet v0.14.3 introduces dynamic L2 gas base fees per SNIP-35, plus faster block times per SNIP-40. Testnet launches 22 Jun 2026, Mainnet 06 Jul 2026. Adds keccak support for client-side proving and switches to quantum-secure Blake hashing. Deprecates RPC 0.8; upgrades to 0.10.1 recommended. Full node upgrade required.