Insert zero blocks on matrix diagonals #704
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Fixes firedrakeproject/firedrake#3066.
Basically we were failing to insert zeros in the right places when we construct the sparsity because we were inserting single zeros along the diagonal, rather than respecting the matrix block size. This was causing vector-valued assembly to crash.
This PR also pins the Cython version used by CI since petsc4py was otherwise not building.