Bump libs/imgui from `9937660` to `b30df88`

[dependabot[bot]]

Bumps libs/imgui from 9937660 to b30df88.

Commits

• b30df88 Table: Angled Headers: internal refactor to facilitate changing angled header...
• 558c57a Fixed static analyzer warning "Pointer to local array 'overlay_buf' is stored...
• 50b2ff0 ImGuiIO: moved IMGUI_DISABLE_OBSOLETE_KEYIO block lower in the structure so o...
• 6ef4f67 ImDrawList: moved cold fields lower in the structure so hot fields are closer...
• a60387a Backends: GLFW: Add define guards for glfw native defines. (#7536)
• 913151c Demo: move progress bars to their own section.
• c895e98 ProgressBar: added indeterminate mode by passing an animated negative value. ...
• b8a44b1 TreeNode: added ImGuiTreeNodeFlags_SpanTextWidth. (#6937)
• baaaaea Demo: tweak TreeNode demo.
• da18fcb Internals: ensure ButtonBehavior() is called with non 0 id.
• Additional commits viewable in compare view

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