Update relm Crate Dependencies

[chrsoo]

Priority: Medium
Labels: technical-debt, area:relm, priority:medium, dependencies

Description:
The relm crate has outdated dependencies that need updating.

Source: Item #55 from consolidated analysis
Files: relm/Cargo.toml

Acceptance Criteria:

• Dependencies updated to latest compatible versions
• Security vulnerabilities addressed
• Tests pass with new dependencies
• Breaking changes documented

Related Issues: #50 (relm warnings)