Update module github.com/relvacode/iso8601 to v1.6.0

This MR contains the following updates:

Package	Type	Update	Change
github.com/relvacode/iso8601	require	minor	v1.4.0 -> v1.6.0

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• Followed upgrade instructions outlined in docs/DEVELOPMENT_MAINTENANCE.md
• Update Docs with new/updated steps as needed
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Upgrade Notices

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