CompatHelper: bump compat for CoordRefSystems to 0.18 for package test, (keep existing compat)#181

JoshuaLampert merged 1 commit intocompathelper/new_version/2025-06-12-01-09-59-721-01756008997JuliaGeometry/MeshIntegrals.jl:compathelper/new_version/2025-06-12-01-09-59-721-01756008997from

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