chore: bump rust to latest stable

[gjermundgaraba]

No description provided.

[eloylp]

Hi @webmaster128 - apologies for the direct ping.

At Eiger, we’re currently building a Solana <-> Axelar bridge. Since the Axelar network uses CosmWasm smart contracts, we need to include certain Solana dependencies that require the latest stable Rust version.

This PR is currently a blocker for us, and we’d greatly appreciate it if it could be reviewed and merged soon. A new release including this change would unblock our integration work.

Thanks a lot in advance, and happy to provide any additional info if needed!

[chipshort]

@eloylp This cannot currently be merged because it is blocked by CosmWasm/cosmwasm#2292. We are currently waiting for a Wasmer release that has full reference-types support because latest Rust enforces having this.

[chipshort]

Alternatively, it might be possible to use latest Rust here and get rid of the problematic call_indirect instruction encoding afterwards in some way. This Rust issue about the topic suggests running through wasm2wat and wat2wasm, but that doesn't seem to be a lossless translation. For example, we use a custom section in the wasm for the migrate_version feature, which doesn't seem to be preserved in the text format.
So this would probably require a more targeted approach.

edit: Actually, it might be possible to disable reference types using some compiler flag? That would be much easier.