Update Octokit from v3.1.2 to v5.0.5

[Suyog241005]

Problem

• Current Octokit version is outdated (v3.2.2)
• Missing latest GitHub API features and security updates
• Project should stay current with dependencies

Solution

• Update octokit to latest stable version (v5.0.5)
• Test that existing functionality still works
• Update any breaking changes if needed

Impact

• ✅ Improved security
• ✅ Access to latest GitHub API features
• ✅ Better performance
• ✅ Future compatibility