CompatHelper: bump compat for "BlockArrays" to "0.12" (#13)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Sheehan Olver <[email protected]>

Author: github-actions[bot]

Project.toml

@@ -36,7 +36,7 @@ ApproxFunFourier = "0.2"
 ApproxFunOrthogonalPolynomials = "0.3"
 ArrayLayouts = "0.1"
 BandedMatrices = "0.14, 0.15"
-BlockArrays = "0.11"
+BlockArrays = "0.11, 0.12"
 BlockBandedMatrices = "0.7, 0.8"
 DomainSets = "0.1"
 FastGaussQuadrature = "0.4"