Use unzip to unpack wheels

I have now gotten an heart attack at least twice because `wheel unpack`
doesn't preserve the timestamps from the archive.

action.yml

@@ -139,7 +139,7 @@ runs:
 
         if [[ "${{ inputs.skip-wheel }}" != 'true' ]]; then
             mkdir -p out/wheels
-            /tmp/baipp/bin/python -m wheel unpack --dest out/wheels *.whl
+            unzip *.whl -d out/wheels
 
             echo -e '\n<details><summary>Wheel contents</summary>\n' >> $GITHUB_STEP_SUMMARY
             (cd /tmp/baipp/dist/out/wheels && tree -Da --timefmt="%Y-%m-%dT%H:%M:%SZ" * | sed 's/^/    /' | tee -a $GITHUB_STEP_SUMMARY)