ci: use stable toolchain

[maschad]

This upgrades the rust toolchain to the latest stable i.e. 1.87.0

Which can be upgraded locally via rustup

rustup update stable

[Copilot]

Pull Request Overview

This PR updates the Rust toolchain to the latest stable version (1.87.0) and aligns various modules to use a boxed error type for AtomaP2pNodeError.

• Bumps Rust default toolchain to 1.87.0 in Dockerfiles and GitHub workflows
• Changes many P2P validation/serialization functions to return Box<AtomaP2pNodeError> and updates tests accordingly
• Refines println! calls in OpenAPI components and silences a Clippy lint in streamer.rs

Reviewed Changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
atoma-service/src/streamer.rs	Added Clippy suppression for field naming
atoma-service/src/components/openapi.rs	Switched println!("{:?}") to {} with display()
atoma-p2p/src/utils.rs	Changed validation functions to return boxed errors
atoma-p2p/src/types.rs	Updated Result alias and error mapping in serializers
atoma-p2p/src/tests.rs	Updated assertions to match boxed error signatures
atoma-p2p/src/service.rs	Unboxed errors from deserialize_with_signature
atoma-p2p-tester/Dockerfile	Bumped default Rust toolchain to 1.87.0
atoma-daemon/src/components/openapi.rs	Switched println!("{:?}") to {} with display()
Dockerfile	Bumped default Rust toolchain to 1.87.0
.github/workflows/coverage.yml	Changed CI toolchain to stable
.github/workflows/ci.yml	Changed CI toolchain to stable

[Copilot]

Use the crate-wide Result<T> alias (which defaults to Box<AtomaP2pNodeError>) instead of spelling out Box<AtomaP2pNodeError> explicitly for consistency.

Suggested change

	) -> Result<(), Box<AtomaP2pNodeError>> {
	) -> Result<()> {

[Copilot]

Similarly, switch this signature to use the crate's Result<T> alias to keep error types consistent across the module.

[Copilot]

This map_err(|e| Box::new(e.into())) can be simplified to .map_err(Into::into)? because Into::into will convert the error into the correct type and ? will box it via the alias.

Suggested change

	ciborium::into_writer(self, (&mut buffer).writer()).map_err(|e| Box::new(e.into()))?;
	ciborium::into_writer(self, (&mut buffer).writer()).map_err(Into::into)?;

[Copilot]

[nitpick] Consider replacing map_err(|e| *e)? with map_err(Box::into_inner)? for clarity when unboxing the error.

Suggested change

	SignedNodeMessage::deserialize_with_signature(&message_data).map_err(|e| *e)?;
	SignedNodeMessage::deserialize_with_signature(&message_data).map_err(Box::into_inner)?;

[Copilot]

[nitpick] If possible, add a brief comment explaining why this lint is suppressed or consider renaming the field instead of disabling the Clippy check for future clarity.

Suggested change

	#[allow(clippy::struct_field_names)]
	#[allow(clippy::struct_field_names)] // Suppressed to maintain consistency with existing naming conventions in the project.