Merge branch 'singhbalwinder/gcam/update-giac_subm'(PR #7822)

GCAM: Update GIAC submodule to bring in PIO fix

Updates the GIAC submodule to fix the PIO call signature to match the v3 version to fix a compilation error (thanks to @jayeshkrishna for this fix).

[BFB]

* singhbalwinder/gcam/update-giac_subm:
  Update giac submodule to bring in PIO fix

Author: singhbalwinder