10.3.0 release notes

Created on 6 June 2024, 7 months ago

Read over the 10.3.0 release notes draft. The section at the top is the initial outline for the release notes. The sections at the bottom need to be completed.
Make sure that all Issues tagged '10.3.0 release notes → are included in the release notes.
Review the format of the release notes, and leave comments on the Google doc where something seems incorrect:
- Ensure that every release note describes a disruptive change. Additions without any disruptive changes belong in the release highlights post, not the release notes.
- Ensure that every release note follows the release note snippet best practices → .
- Ensure that every release note (save those about a dependency update) includes a link to a change record.
- Ensure that release notes are formatted correctly in bulleted lists, and that each list item has a blank newline between the tag and the list item text. For example:
```
<li>

A disruptive change is described here. For more information, review <a href="">the change record about what-and-such</a>.

</li>
```
- Follow the rough organization suggested by committers. If you think something belongs in a different section, leave a comment.
Use the Google Docs "suggestion" feature to suggest corrections, readability improvements, etc.
Comment on this issue to receive credit for working on the release notes.