Fix M1 worklfow comments (#6409)

* shlex -> shutil

* [SKIP CI]

* [skip ci]
Co-authored-by: Vasilis Vryniotis <datumbox@users.noreply.github.com>

.github/workflows/build-m1-binaries.yml

@@ -43,7 +43,7 @@ jobs:
           PY_VERS: ${{ matrix.py_vers }}
         run: |
           . ~/miniconda3/etc/profile.d/conda.sh
-          # Needed for JPEG library detection as setup.py detects conda presence by running `shlex.which('conda')`
+          # Needed for JPEG library detection as setup.py detects conda presence by running `shutil.which('conda')`
           export PATH=~/miniconda3/bin:$PATH
           set -ex
           . packaging/pkg_helpers.bash

.github/workflows/test-m1.yml

@@ -31,7 +31,7 @@ jobs:
           PY_VERS: ${{ matrix.py_vers }}
         run: |
           . ~/miniconda3/etc/profile.d/conda.sh
-          # Needed for JPEG library detection as setup.py detects conda presence by running `shlex.which('conda')`
+          # Needed for JPEG library detection as setup.py detects conda presence by running `shutil.which('conda')`
           export PATH=~/miniconda3/bin:$PATH
           set -ex
           conda create -yp ${ENV_NAME} python=${PY_VERS} numpy libpng jpeg scipy