v1.20.0

This is the release for polkadot-stable2509-2. Also see branch polkadot-stable2509-2
❗Note that due to incompatibilities in the dependencies this release has only limited support for no-std and wasm compilation.
❗If you use these features we recommend to wait for the upcoming polkadot-stable2512 release.

What's Changed since v1.19.0

• No changes