build(deps): bump Externals/imgui from `c807192` to `66b7625`

Created by: dependabot[bot]

Bumps Externals/imgui from c807192 to 66b7625.

Commits

• 66b7625 Backends: OpenGL3: Fixed restoration of a potentially deleted OpenGL program....
• bfce775 Simpified code in GetKeyData() and used ImGuiKey_KeysData_OFFSET for consiste...
• 2496b97 Backends: SDL2,SDL3: Accept SDL_GetPerformanceCounter() not returning a monot...
• e9743d8 Drag and Drop: Clear state on EndDragDropTarget() with delivery + fixed handl...
• 2ee77aa Missing closing parenthesis in debug popup log (#6177)
• 696a533 TestEngine: added ImGuiItemStatusFlags_Inputable flag report to facilitate fu...
• 752603b Fixed imgui_single_file.h for IMGUI_DEFINE_MATH_OPERATORS change. (#6164, #61...
• a1b8457 Moved the optional "courtesy maths operators" (#define IMGUI_DEFINE_MATH_OPER...
• 5d74891 Backends: Win32: Use WM_NCMOUSEMOVE / WM_NCMOUSELEAVE to track mouse position...
• 4f630b0 imgui_freetype: fixed non-ASCII characters in sources. (#6166)
• Additional commits viewable in compare view

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