Failing matrix test on `nightly`

[lgoettgens]

observed e.g. in https://github.com/Nemocas/AbstractAlgebra.jl/actions/runs/11796444574/job/32858309057#step:6:808

In 1.12.0-DEV.1611, commit 1e0cee5c875 it still worked, while 1.12.0-DEV.1613, Commit 366a38e6ed6 was the first failure.
From looking at the commit messages, I suppose this is due to JuliaLang/julia#56531.

Generic.Mat.constructors: Test Failed at /home/runner/work/AbstractAlgebra.jl/AbstractAlgebra.jl/test/generic/Matrix-test.jl:219
  Expression: T[1; 2 3]
    Expected: ArgumentError
      Thrown: DimensionMismatch
      DimensionMismatch: row 2 has mismatched number of columns (expected 1, got 2)
      Stacktrace:
       [1] typed_hvcat(::Type{Int64}, ::Tuple{Int64, Int64}, ::Int64, ::Vararg{Int64})
         @ Base ./abstractarray.jl:2286
       [2] hvcat_internal(::Tuple{Int64, Int64}, ::Int64, ::Int64, ::Vararg{Int64})
         @ SparseArrays /opt/hostedtoolcache/julia/nightly/x64/share/julia/stdlib/v1.12/SparseArrays/src/sparsevector.jl:1284
       [3] hvcat(::Tuple{Int64, Int64}, ::Int64, ::Int64, ::Vararg{Int64})
         @ SparseArrays /opt/hostedtoolcache/julia/nightly/x64/share/julia/stdlib/v1.12/SparseArrays/src/sparsevector.jl:1311
       [4] typed_hvcat(::AbstractAlgebra.Generic.PolyRing{Rational{BigInt}}, ::Tuple{Int64, Int64}, ::Int64, ::Vararg{Int64})
         @ AbstractAlgebra ~/work/AbstractAlgebra.jl/AbstractAlgebra.jl/src/Matrix.jl:7095
       [5] macro expansion
         @ ~/work/AbstractAlgebra.jl/AbstractAlgebra.jl/test/generic/Matrix-test.jl:219 [inlined]
       [6] macro expansion
         @ /opt/hostedtoolcache/julia/nightly/x64/share/julia/stdlib/v1.12/Test/src/Test.jl:773 [inlined]
       [7] macro expansion
         @ ~/work/AbstractAlgebra.jl/AbstractAlgebra.jl/test/generic/Matrix-test.jl:219 [inlined]
       [8] macro expansion
         @ /opt/hostedtoolcache/julia/nightly/x64/share/julia/stdlib/v1.12/Test/src/Test.jl:1700 [inlined]
       [9] top-level scope
         @ ~/work/AbstractAlgebra.jl/AbstractAlgebra.jl/test/generic/Matrix-test.jl:112