Update the changelog for the new version

[bhazelton]

Description

Set up for a new release that is compatible with pyuvdata v3.0 and numpy v2.0.

Motivation and Context

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Reference simulation update or replacement
• [ ] Documentation change (documentation changes only)
• [x] Version change
• [ ] Build or continuous integration change

Checklist:

For all pull requests:

• [x] I have read the contribution guide.
• [x] My code follows the code style of this project.

Version change checklist:

• [x] I have updated the CHANGELOG to put all the unreleased changes under the new version (leaving the unreleased section empty).
• [x] I have run the appropriate tests for this level of version change (described in the readme under versioning).

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.80%. Comparing base (ee1dc76) to head (84a0d6d).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #477 +/- ## =========================================== - Coverage 100.00% 98.80% -1.20% =========================================== Files 11 11 Lines 2176 2176 =========================================== - Hits 2176 2150 -26 - Misses 0 26 +26 ```

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