New version: DiffEqFlux v4.0.0

[JuliaRegistrator]

• Registering package: DiffEqFlux
• Repository: https://github.com/SciML/DiffEqFlux.jl
• Created by: @avik-pal
• Version: v4.0.0
• Commit: f1843f379b70d2ae0a1aa13eda3afeebc7e9ea78
• Reviewed by: @avik-pal
• Reference: SciML/DiffEqFlux.jl@f1843f3#commitcomment-146847731
• Description: Pre-built implicit layer architectures with O(1) backprop, GPUs, and stiff+non-stiff DE solvers, demonstrating scientific machine learning (SciML) and physics-informed machine learning methods

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