chore: bump rust version to 1.85.1

[djordon]

Description

Bump the version of Rust to 1.85.1. The diff is due to sorting differences.

Changes

• Bump the rust version in the workspace. Also update the base images used in our rust containers.
• Use the 2024 edition in the signer, sbtc, emily, blocklist-client, and blocklist-openapi-gen crates. The other generated crates remain unchanged.
• The std::env::set_var function and std::env::remove_var functions are now unsafe, so made some changes related to that in our tests.
• A few changes in the signer crate related to new things that clippy picks up.
• Everything else is related to how rust now sorts imports in this edition. It is explained in https://doc.rust-lang.org/edition-guide/rust-2024/rustfmt-version-sorting.html. This is where all the noise diffs come from.

Testing Information

No functionality has changed, so if tests pass then we should be good.

Checklist:

• I have performed a self-review of my code

[Copilot]

Pull Request Overview

This PR bumps the Rust version to 1.85.1 and updates several crates to use the 2024 edition. The changes are primarily formatting updates (including import reordering and multi-line attribute formatting) resulting from the Rust version bump and rustfmt differences.

• Update Cargo.toml files to reflect the new edition and rust version.
• Reorder imports and adjust error message attributes for improved consistency.
• Remove duplicate imports and update function signatures where needed.

Reviewed Changes

Copilot reviewed 106 out of 109 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
emily/handler/src/common/error.rs	Reformats the error message attribute for consistency.
emily/handler/src/api/routes/mod.rs	Adjusts the verbose_not_found_route signature formatting.
emily/handler/src/api/models/withdrawal/requests.rs	Removes duplicate import and reorders imports.
emily/handler/src/api/models/deposit/requests.rs	Removes duplicate import and reorders imports.
emily/handler/src/api/handlers/withdrawal.rs	Reorders imports and removes duplicate imports for clarity.
emily/handler/src/api/handlers/new_block.rs	Reorders imports to align with updated preferred ordering.
emily/handler/src/api/handlers/internal.rs	Refactors long error message formatting into a multi-line format.
emily/handler/src/api/handlers/deposit.rs	Simplifies pattern matching formatting and reorders secp256k1 imports.
emily/handler/src/api/handlers/chainstate.rs	Reorders warp imports for a consistent ordering pattern.
emily/handler/Cargo.toml, blocklist-openapi-gen/Cargo.toml, blocklist-client/Cargo.toml	Bump edition to 2024 to comply with the new Rust edition.
blocklist-client/src/logging.rs, blocklist-client/src/api/handlers.rs	Update import ordering for consistency with new style guidelines.
README.md	Updates the documented cargo version to 1.85.1.

Files not reviewed (3)

• .github/actions/dockerfiles/Dockerfile.blocklist-client.debian: Language not supported
• .github/actions/dockerfiles/Dockerfile.signer.debian: Language not supported
• docker/sbtc/Dockerfile: Language not supported

[cylewitruk]

LGTM. I'm going to hijack this and resolve the conflicts plus update a crate that was missed (emily-openapi-spec) so that we're ready to go.

[Jiloc]

lgtm! Checking all these files was mind numbing 😵