New features and enhancements

• Support validation for ui.select (#2436, #2498 by @me21, @falkoschindler)
• Introduce media_type parameter for ui.download (#2491, #2494 by @me21, @iron3oxide, @falkoschindler)
• Relax upper bounds on some dependencies (#2485, #2506 by @sscherfke)

Bugfixes

• Fix event handler registration for ui.plotly (#2435, #2504, #2505, #2516 by @Wzhipeng, @bmaranville, @platinops)
• Fix events with "Restricted" arguments on Firefox (#2469, #2499 by @me21, @falkoschindler)
• Shorten filepaths for static fonts to avoid a rare installation problem (#2480, #2512 by @mcohan, @falkoschindler)

Documentation

• Fix broken target links in documentation strings (#2459 by @bmaranville)
• Fix duplicate links on some reference pages (#2495 by @rodja, @falkoschindler)