20.3.0

What's Changed

• Host function protocol gating by @jayz22 in #1348
• fix rust-version compilation issue by @sisuresh in #1335
• Refactor soroban-simulation to use the e2e_invoke by @dmkozh in #1354
• Add a comment for supported protocol versions in protocol_gated_dummy by @jayz22 in #1356
• Cleanup Cargo.toml for unstable-next-api feature by @dmkozh in #1358
• Small fixes in soroban-simulation by @dmkozh in #1361
• Emulate account entry extensions in simulation. by @dmkozh in #1363
• Bump version to 20.3.0 by @github-actions in #1365

Full Changelog: v20.2.2...v20.3.0