bump: Update both crates to version 0.1.5

[0xvasanth]

Summary

Synchronized version update for both main crate and derive crate to 0.1.5

Changes

• Updated Cargo.toml version to 0.1.5
• Updated gonfig_derive/Cargo.toml version to 0.1.5
• Updated dependency reference to match new derive crate version
• Updated Cargo.lock with new version constraints

Testing

• All tests pass
• Both crates compile successfully
• Pre-commit hooks validated
• Derive macro dependency properly resolved

This update ensures version consistency across the workspace and tests our improved version-bump workflow.

[Copilot]

Pull Request Overview

This PR synchronizes version numbers across the workspace by bumping both the main crate and derive crate from their previous versions to 0.1.5.

• Updates main crate version from 0.1.3 to 0.1.5
• Updates derive crate version from 0.1.2 to 0.1.5
• Updates dependency reference to match new derive crate version

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
Cargo.toml	Updates main crate version to 0.1.5 and derive dependency version reference
gonfig_derive/Cargo.toml	Updates derive crate version to 0.1.5

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