fix: Publishing Migration To Central Portal

[OS-pedrogustavobilro]

Description

We currently publish the library in Maven Central through OSSRH, however this needs to be changed due OSSRH being shutdown in after June 30th 2025.

Migration of io.ionic namespace to Central Portal has already been done, this PR takes care of updating the publishing logic - which uses a new token that is now accessed in different github secrets.

Relevant References:

• https://central.sonatype.org/faq/what-is-different-between-central-portal-and-legacy-ossrh/
• https://github.com/gradle-nexus/publish-plugin?tab=readme-ov-file#publishing-to-maven-central-via-sonatype-central

Type of changes

• Fix (non-breaking change which fixes an issue)
• Feature (non-breaking change which adds functionality)
• Refactor (cosmetic changes)
• Breaking change (change that would cause existing functionality to not work as expected)

Checklist

• CHANGELOG.md file is correctly updated
• Changes require an update to the documentation
  • Documentation has been updated accordingly

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