Add checksum update option for local builds.

[ZzEeKkAa]

Checklist

• I added a descriptive title
• I searched open requests and couldn't find a duplicate

What is the idea?

Add an option to conda build something like --update-checksums that will update checksums in the meta.yaml source section with pulled files, instead of complaining about checksum mismatch.

Why is this needed?

It will be useful for a multi output recipes on version update, like this: https://github.com/conda-forge/intel-compiler-repack-feedstock/blob/main/recipe/meta.yaml

What should happen?

Checksums should be updated instead of producing RuntimeError: SHA256 mismatch: 'd0abdbc25b665594dfc585f948f1278eca965f30b89b474329ff0375f3c390b1' != '7b39b7446b875408045a3b578ad467060db66be1c71dbbf25e1310c53a0857ea'. It get's really time consuming, one the list of sources is getting longer.

Additional Context

No response