* cannon: Adjust initial heap start

This gives the program more memory to work with; minimizing the chance
of heap/stack corruption.

* Update cannon/mipsevm/patch.go
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Co-authored-by: clabby <ben@clab.by>
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>