CompatHelper: bump compat for DiffEqDevTools to 3, (keep existing compat)#9

github-actions[bot] wants to merge 1 commit intomaincontrol-toolbox/CTDiffFlow.jl:mainfrom

compathelper/new_version/2026-04-23-00-15-10-626-00528018175control-toolbox/CTDiffFlow.jl:compathelper/new_version/2026-04-23-00-15-10-626-00528018175Copy head branch name to clipboard