build(deps): bump Externals/imgui from `c807192` to `6ca1556`

Created by: dependabot[bot]

Bumps Externals/imgui from c807192 to 6ca1556.

Commits

• 6ca1556 Nav: Fixed SetItemDefaultFocus() from not scrolling when item is partially vi...
• bb224c8 Examples: Updated all examples application to enable ImGuiConfigFlags_NavEnab...
• 2bb9e35 Nav: Tabbing now cycles through all items when ImGuiConfigFlags_NavEnableKeyb...
• e83fb46 Renamed PushAllowKeyboardFocus()/PopAllowKeyboardFocus() to PushTabStop()/Pop...
• a322122 InputText: Fixed not being able to use CTRL+Tab while an InputText() using Ta...
• 3b2f617 BeginTooltip: Added 'bool' return value to BeginTooltip() for API consistency...
• b5f9381 Made internal clipboard/IME handlers not rely on implicit GImGui context (#5856)
• c8ad25c Make classes not depend on the implicit GImGui context (#5856, #6199): ImGuiW...
• 10ace22 Make classes not depend on the implicit GImGui context (#6199, #5856, #6199):...
• 5a1e6b6 Nav: Fixed an issue with Gamepad navigation when the movement lead to a scrol...
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