fix[#1]: none of the feeds vaildate

[GabsEdits]

Closes #1

[Copilot]

Pull Request Overview

This PR addresses feed validation issues by updating both RSS and JSON feed formats.

• Removed the extraneous element from the RSS feed output.
• Removed the "updated" property from JSON feed tests and corrected the date formatting call.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
test.ts	Adjusted tests to expect feeds without the element and without the "updated" property.
src/rss.ts	Removed the redundant element in the RSS feed generation.
src/json.ts	Fixed the date_published field to correctly invoke toUTCString(), ensuring proper timestamp.

Comments suppressed due to low confidence (1)

src/rss.ts:51

• Consider adding an inline comment explaining why the element has been removed to ensure future maintainers understand this change is intended to comply with feed validation standards.

    <author>${emailPart}(${escapedName})</author>\n