bot: Update proposals candid bindings

[pr-automation-bot-public]

Motivation

We would like to render all the latest proposal types.
Even with no changes, just updating the reference is good practice.

Changes

• Update the version of IC_COMMIT_FOR_PROPOSALS specified in config.json.
• Updated the proposals candid files to the versions in that commit.
• Updated the Rust code derived from .did files in the proposals payload rendering crate.

Tests

• Please check the API updates for any breaking changes that affect our code.
• Please check for new proposal types and add tests for them.

Breaking changes are:

• New mandatory fields
  • Removing mandatory fields
  • Renaming fields
  • Changing the type of a field
  • Adding new variants