build(deps): bump Externals/imgui from `9166743` to `259560a`

Created by: dependabot[bot]

Bumps Externals/imgui from 9166743 to 259560a.

Commits

• 259560a Demo: moved sections around in prevision for adding nicer separators.
• 27f2dd5 Internals: move "%s" skip-formatting logic to ImFormatStringToTempBuffer() fu...
• d73e328 Backends: WebGU: Revert the implicit render pipeline layout generation as int...
• fc50532 InputText: On OSX, inhibit usage of Alt key to toggle menu when active (used ...
• 5741cba Internals: ImFileOpen: fixed misleading use of ImWchar (would allocate more w...
• f4ef420 InputText: Added support for Ctrl+Delete to delete up to end of word. (#6067)
• 0749061 Misc: Tolerate zero delta-time under Emscripten. (#6114, #3644)
• fe0a24f Examples: Win32: Fixed examples using RegisterClassW() since 1.89 to also cal...
• 3d8885c TabBar: Internals: add GetCurrentTabBar(), TabBarFindTabByOrder(), TabBarGetC...
• 739a79b ImDrawList: Added missing early-out in AddPolyline() and AddConvexPolyFilled(...
• Additional commits viewable in compare view

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