CompatHelper: bump compat for "DomainSets" to "0.4" (#43)

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Author: github-actions[bot]

Project.toml

@@ -33,7 +33,7 @@ BlockArrays = "0.11, 0.12"
 BlockBandedMatrices = "0.7, 0.8"
 Calculus = "0.5"
 DSP = "0.6"
-DomainSets = "0.3"
+DomainSets = "0.3, 0.4"
 DualNumbers = "0.6.2"
 FFTW = "0.3, 1"
 FastGaussQuadrature = "0.4"