fix(deps): update module github.com/relvacode/iso8601 to v1.4.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github.com/relvacode/iso8601	v1.3.0 -> v1.4.0

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Release Notes

relvacode/iso8601 (github.com/relvacode/iso8601)

v1.4.0

Compare Source

What's Changed

• Replace ISO8061 typos with ISO8601 by @​henrybear327 in https://github.com/relvacode/iso8601/pull/17
• Permit only year component in date by @​relvacode in https://github.com/relvacode/iso8601/pull/23

New Contributors

• @​henrybear327 made their first contribution in https://github.com/relvacode/iso8601/pull/17

Full Changelog: relvacode/iso8601@v1.3.0...v1.4.0

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