feat: pypy 3.8 & pip 21.3 (#881)

* Update dependencies

* fix: support pypy 3.8 and 7.3.7

Co-authored-by: henryiii <henryiii@users.noreply.github.com>
Co-authored-by: Henry Schreiner <henryschreineriii@gmail.com>

cibuildwheel/resources/constraints-python36.txt

@@ -4,19 +4,19 @@
 #
 #    bin/update_dependencies.py
 #
-backports.entry-points-selectable==1.1.0
+backports.entry-points-selectable==1.1.1
     # via virtualenv
 delocate==0.10.0
     # via -r cibuildwheel/resources/constraints.in
 distlib==0.3.3
     # via virtualenv
-filelock==3.3.0
+filelock==3.3.2
     # via virtualenv
-importlib-metadata==4.8.1
+importlib-metadata==4.8.2
     # via
     #   backports.entry-points-selectable
     #   virtualenv
-importlib-resources==5.2.2
+importlib-resources==5.4.0
     # via virtualenv
 platformdirs==2.4.0
     # via virtualenv
@@ -26,7 +26,7 @@ typing-extensions==3.10.0.2
     # via
     #   delocate
     #   importlib-metadata
-virtualenv==20.8.1
+virtualenv==20.10.0
     # via -r cibuildwheel/resources/constraints.in
 wheel==0.37.0
     # via
@@ -38,7 +38,7 @@ zipp==3.6.0
     #   importlib-resources
 
 # The following packages are considered to be unsafe in a requirements file:
-pip==21.2.4
+pip==21.3.1
     # via -r cibuildwheel/resources/constraints.in
-setuptools==58.2.0
+setuptools==58.5.3
     # via -r cibuildwheel/resources/constraints.in