[Bot] Update dependencies (#1213)

Update dependencies

Co-authored-by: cibuildwheel-bot[bot] <83877280+cibuildwheel-bot[bot]@users.noreply.github.com>

cibuildwheel/resources/constraints-python36.txt

@@ -2,7 +2,7 @@
 # This file is autogenerated by pip-compile with python 3.6
 # To update, run:
 #
-#    bin/update_dependencies.py
+#    nox -s update_constraints-3.6
 #
 delocate==0.10.2
     # via -r cibuildwheel/resources/constraints.in
@@ -16,13 +16,11 @@ importlib-resources==5.4.0
     # via virtualenv
 platformdirs==2.4.0
     # via virtualenv
-six==1.16.0
-    # via virtualenv
 typing-extensions==4.1.1
     # via
     #   delocate
     #   importlib-metadata
-virtualenv==20.15.1
+virtualenv==20.16.3
     # via -r cibuildwheel/resources/constraints.in
 wheel==0.37.1
     # via