math/suitesparse*: upgrade to v7.12.0

This includes:

• UMFPACK to 6.3.7;
• LAGraph to 1.2.1;
• ParU to 1.1.0;
• GraphBLAS to 10.2.0;
• SPQR to 4.3.6;
• Mongoose to 3.3.6.

Release notes at
https://github.com/DrTimothyAldenDavis/SuiteSparse/releases/tag/v7.12.0