Add compat downgrade YAML #2273

Job	Run time
DelayDiffEq.jl/Interface/1.9	1m 38s
DelayDiffEq.jl/Integrators/1.9	1m 39s
DelayDiffEq.jl/Regression/1.9	1m 40s
StochasticDiffEq.jl/Interface1/1.9	1m 41s
StochasticDiffEq.jl/Interface2/1.9	1m 37s
StochasticDiffEq.jl/Interface3/1.9	1m 38s
StochasticDiffEq.jl/AlgConvergence/1.9	1m 37s
DiffEqCallbacks.jl/All/1.9	1m 46s
SciMLSensitivity.jl/Core1/1.9	36s
SciMLSensitivity.jl/Core2/1.9	41s
SciMLSensitivity.jl/Core3/1.9	39s
SciMLSensitivity.jl/Core4/1.9	42s
SciMLSensitivity.jl/Core5/1.9	40s
ModelingToolkit.jl/All/1.9	1m 38s
DiffEqDevTools.jl/Core/1.9	1m 40s
ProbNumDiffEq.jl/Downstream/1.9	1m 40s
DelayDiffEq.jl/Interface/1	1m 37s
DelayDiffEq.jl/Integrators/1	1m 37s
DelayDiffEq.jl/Regression/1	1m 42s
StochasticDiffEq.jl/Interface1/1	1m 40s
StochasticDiffEq.jl/Interface2/1	1m 39s
StochasticDiffEq.jl/Interface3/1	1m 38s
StochasticDiffEq.jl/AlgConvergence/1	1m 36s
DiffEqCallbacks.jl/All/1	1m 43s
SciMLSensitivity.jl/Core1/1	35s
SciMLSensitivity.jl/Core2/1	42s
SciMLSensitivity.jl/Core3/1	40s
SciMLSensitivity.jl/Core4/1	36s
SciMLSensitivity.jl/Core5/1	39s
ModelingToolkit.jl/All/1	1m 38s
DiffEqDevTools.jl/Core/1	1m 37s
ProbNumDiffEq.jl/Downstream/1	1m 38s
	42m 49s

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