CompatHelper: bump compat for LazySets to 3, (keep existing compat) #416

Job	Run time
Documentation	5m 33s
Julia 1.6 - ubuntu-latest - x64 - push	8m 37s
Julia 1.6 - ubuntu-latest - x86 - push	10m 36s
Julia 1.6 - macOS-latest - x64 - push	11m 32s
Julia 1.6 - windows-latest - x64 - push	14m 42s
Julia 1.6 - windows-latest - x86 - push	20m 45s
Julia 1 - ubuntu-latest - x64 - push	13m 37s
Julia 1 - ubuntu-latest - x86 - push	6m 52s
Julia 1 - macOS-latest - x64 - push	20m 45s
Julia 1 - windows-latest - x64 - push	15m 3s
Julia 1 - windows-latest - x86 - push	8m 41s
Julia nightly - ubuntu-latest - x64 - push	5m 44s
Julia nightly - ubuntu-latest - x86 - push	7m 8s
Julia nightly - macOS-latest - x64 - push	7m 52s
Julia nightly - windows-latest - x64 - push	7m 6s
Julia nightly - windows-latest - x86 - push	8m 47s
	2h 53m 20s

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