Add CHANGELOG for 1.7.2 release

[philippjfr]

This patch release includes a number of important bug fixes, optimizations, and compatibility updates, particularly for React and ESM-based components. It also includes enhancements to the Tabulator table and more robust support for Audio/Video panes. Many thanks to @etihwo for his continued contributions and the maintainer team @hoxbro and @philippjfr.

Enhancements

• Support for passing bytes and BytesIO objects to Audio and Video panes (#7963)
• Add header tooltips to Tabulator (#7988)
• Optimize layout calculations for ESM components (#7989)
• Allow nested ReactComponents to bypass Shadow DOM (#7991)
• Support --ico-path CLI option to support explicit .ico path specification (#7992)
• Loosen parameter type for ReactiveExpr.widget_layout (#7964)
• Automatically unblock Comm on WebSocket re-connect (#7986)

Bug Fixes

• Fix Tabulator fast design and fix styling issues (#7956)
• Keep reference state consistent after Pyodide syncing (#7966)
• Ensure correct model is used when determining if a link is set up (#7968)
• Do not dispatch events on hold/unhold when the document is uninitialized (#7972)
• Ensure theming does not error on PyComponent (#7975)
• Prevent stylesheet patch from dispatching during initial load (#7978)
• Fix caching issue for ESM render modules (#7990)
• Correct initialization behavior of ReactComponent (#7996)

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