Update PQClean commit and delete patch for HQC

[SWilson4]

PQClean adopted our patch in PQClean/PQClean#578, so it is no longer necessary to apply it as part of the copy_from_upstream process. Unfortunately a lot of whitespace changes (presumably due to astyle upstream?) landed as well... I recommend using git diff --ignore-blank-lines main to review.

• Does this PR change the input/output behaviour of a cryptographic algorithm (i.e., does it change known answer test values)? (If so, a version bump will be required from x.y.z to x.(y+1).0.)
• Does this PR change the list of algorithms available -- either adding, removing, or renaming? Does this PR otherwise change an API? (If so, PRs in fully supported downstream projects dependent on these, i.e., oqs-provider will also need to be ready for review and merge by the time this is merged.)

[baentsch]

Thanks -- also for improving the upstream!