Revert GCC 11 Linux pinning

[jakirkham]

Once issue ( pybind/pybind11#4606 ) is resolved, would revert commit ( 68d36e6 ) and re-render

[jakirkham]

Think we can do this now. In pybind11's 2.12.0 release, they included this fix: pybind/pybind11@3414c56

We included that release in conda-forge some time ago: conda-forge/pybind11-feedstock#94

So would just drop this use_local: true line and re-render:

pp-sketchlib-feedstock/.ci_support/migrations/cuda120.yaml

Lines 5 to 8 in a5de256

	# Vendor CUDA 12 migrator to use GCC 11.
	# This is needed to workaround a pybind + GCC 12 + nvcc 12 bug
	# xref: https://github.com/pybind/pybind11/issues/4606
	use_local: true