Bump version to 1.6.0

[github-actions]

Automated changes by create-pull-request GitHub action

[sonar-review-alpha]

Summary

This PR bumps the project version from 1.5.0 to 1.6.0 across all build configuration files. The version changes are synchronized across both the Rust analyzer (Cargo.toml/Cargo.lock) and the Gradle-based plugin components, with SNAPSHOT versions updated to 1.6.0-SNAPSHOT for ongoing development.

What reviewers should know

What to verify:

• All four version references are consistently updated to 1.6.0 (or 1.6.0-SNAPSHOT)
• The Cargo.lock file matches the Cargo.toml version declaration
• Both the analyzer and plugin submodules have aligned version numbers

Potential gaps to check:

• Verify there are no additional version strings in documentation, CI/CD workflows, or other manifests that also need updating
• Consider whether release notes or CHANGELOG entries should accompany this version bump (not included in this PR)
• Check if any version-dependent tests or integration tests need attention

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[sebastien-marichal]

Testing that mise.toml was not committed, see #216