chore: Update sonatype endpoint for publishing

[vincetran]

• PR conforms to Pull Request guidelines.

Issue #, if available: N/A

Description of changes:
Followed the migration wiki and Central Portal documentation to make these changes. After this is pushed, I'll have to also modify the build spec for the publish CodeBuild project as we need to manually tell the API "we're done uploading, start staging the repository" then we can finish our publishing flow from the UI.

How did you test these changes?
Did test publishes of Liveness to Central Portal and validated that they showed up.

Documentation update required?

• No
• Yes (Please include a PR link for the documentation update)

General Checklist

• Added Unit Tests
• Added Integration Tests
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)
• Ensure commit message has the appropriate scope (e.g fix(liveness): message, fix(authenticator): message, fix(all): message)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.15%. Comparing base (ab7ba13) to head (5e4b922).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #239   +/-   ##
=======================================
  Coverage   29.15%   29.15%           
=======================================
  Files          94       94           
  Lines        4377     4377           
  Branches      510      510           
=======================================
  Hits         1276     1276           
  Misses       2994     2994           
  Partials      107      107           

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