release: release v1.3.6

[niteshpurohit]

• Bumped version from 1.3.5 to 1.3.6 in Gemfile.lock and version.rb for release.
• Updated CHANGELOG.md to reflect new maintenance updates and CI improvements.

[github-actions]

	1 Warning
⚠️	⚠️ No tests/specs modified. Please ensure tests are updated for any Ruby code changes.

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[Copilot]

Pull request overview

Prepares the mutils gem for the v1.3.6 release by bumping the gem version and updating the changelog to include the latest maintenance and CI-related updates.

Changes:

• Bumped Mutils::VERSION from 1.3.5 to 1.3.6.
• Updated Gemfile.lock to reflect mutils (1.3.6) for the local path spec.
• Added a 1.3.6 entry to CHANGELOG.md and normalized subsection heading levels for recent entries.

Reviewed changes

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

File	Description
mutils/lib/mutils/version.rb	Updates the gem’s version constant to 1.3.6.
mutils/Gemfile.lock	Updates the locked local gem version to 1.3.6.
CHANGELOG.md	Adds release notes for 1.3.6 and fixes heading levels for subsections.

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