chore: prepare release 0.4.20

[manu0466]

Overview

This PR updates the project to release version 0.4.20 of both the staking and treasury contracts.

closes: #XXXX

What changes have been made in this PR?

• [ ]

Checklist

---

• Appropriate labels applied
• Targeted PR against correct branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Wrote unit and integration
• Updated relevant documentation

[coderabbitai]

Walkthrough

In this update, various configuration files and code structures have been refined within a Rust workspace. Specifically, version updates were made in Cargo.toml files, and the MigrateMsg enum was refactored into a struct in the treasury contract module, enhancing the organization and consistency of the project.

Changes

File	Change Summary
Cargo.toml	Updated workspace package version from "0.4.19" to "0.4.20".
contracts/treasury/Cargo.toml	Transitioned package metadata fields to use workspace = true for better consistency and centralized configuration. Added several new fields also set to workspace = true.
contracts/treasury/src/msg.rs	Refactored MigrateMsg from an enum to a struct to possibly simplify and clarify its representation.

Sequence Diagrams

The changes described are primarily structural and configurational enhancements, rather than functional modifications; therefore, sequence diagrams are not applicable.

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[coderabbitai]

Actionable comments posted: 1

Review details

Configuration used: CodeRabbit UI
Review profile: CHILL

Commits

Files that changed from the base of the PR and between bd2d7d2 and 05f4b5c.

Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

Files selected for processing (3)

• Cargo.toml (1 hunks)
• contracts/treasury/Cargo.toml (1 hunks)
• contracts/treasury/src/msg.rs (1 hunks)

Files skipped from review due to trivial changes (2)

• Cargo.toml
• contracts/treasury/Cargo.toml

[rustcandy]

LGTM!