Update Magnum to latest

[mosra]

Motivation and Context

Update of the Magnum submodules containing changes from the last 4+ months.

• The Basis plugins now use a Zstd submodule instead of a heavily outdated build bundled with Basis itself. It should be significantly faster and more secure also. (Actually, it seems that Zstd wasn't actually present in the repo before, which means UASTC files probably never worked? Now they will.)
• Debug performance improvements for EnumSet, StridedArrayView, BitArray / BitArrayView and String containers.
• It's now possible to call StringView::join() with a std::vector<std::string> argument 😱
• Reduced dependency on STL headers, in particular <utility> and <tuple> in more places
• Various fixes for compatibility with newer Emscripten versions
• The Pointer class now checks at compile times that a type is defined on deletion, preventing resource leaks due to the destructor not being called. It also disallows conversion to non-trivial/non-virtual bases, where a resource leak would happen due to the derived class destructor not being called.
• Math::angle() for quaternions was deprecated as it's actually returning a half-angle. Math::halfAngle() should be used now instead as it's named appropriately (and math.half_angle() in case of Python), an angle() function returning a full angle will be reintroduced after enough time passes to make sure it doesn't change behavior of existing code.
• Trade::MeshData and the GltfImporter now support meshes with morph targets.
• Working around a bug in Qualcomm Adreno drivers (Oculus Quest, e.g.) causing shaders to be silently miscompiled, not displaying anything
• Adapted detection of certain WebGL extensions to changes in their names
• Worked around some more cases where containers using T{} didn't work with classes that had a base with an explicit constructor.
• Recognizing the NV_geometry_shader_passthrough extension
• Near/far plane distance queries in Matrix4
• Ability to draw a sub-range of an indexed GL::Mesh without having to create a temporary GL::MeshView
• Platform::GlfwApplication now emits a viewport event when moving the windows across macOS displays with different DPI. Note that this isn't a complete support for DPI change events across all platforms, that's still quite far ahead.
• GltfSceneConverter now preserves PBR materials even if they're empty, instead of removing them
• BasisImporter and KtxImporter now warn if the file is missing orientation metadata, to aid with debugging asset errors
• Improved test coverage for JpegImageConverter and PngImageConverter
• Support for more legacy formats in DdsImporter, especially to be found in various FBX files
• Emscripten support in OpenExrImporter and OpenExrImageConverter, in particular correct exception handling when a file fails to be parsed
• Other changes, unrelated to Habitat.

How Has This Been Tested

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[jturner65]

Glad to see the Near/Far plane calcs make it in to Habitat finally.