Upgrade setuptools from 49.6.0 to 50.3.0 and wheel from 0.31.1 to 0.3…

…5.1 (pantsbuild#10803)

Setuptools: https://github.com/pypa/setuptools/blob/master/CHANGES.rst
Wheel:  https://wheel.readthedocs.io/en/stable/news.html

3rdparty/python/constraints.txt

@@ -1,10 +1,10 @@
-# Generated by build-support/bin/generate_lockfile.sh on Mon Aug 10 13:36:18 EDT 2020
+# Generated by build-support/bin/generate_lockfile.sh on Thu Sep 17 15:16:52 PDT 2020
 ansicolors==1.1.8
 beautifulsoup4==4.6.3
 certifi==2020.6.20
-cffi==1.14.1
+cffi==1.14.2
 chardet==3.0.4
-cryptography==3.0
+cryptography==3.1
 dataclasses==0.6
 fasteners==0.15
 idna==2.10
@@ -14,7 +14,7 @@ mypy-extensions==0.4.3
 packaging==20.4
 pathspec==0.8.0
 pex==2.1.16
-pip==19.0.3
+pip==20.1.1
 psutil==5.7.0
 pycparser==2.20
 pyOpenSSL==19.1.0
@@ -24,7 +24,7 @@ python-Levenshtein==0.12.0
 PyYAML==5.3.1
 requests==2.24.0
 setproctitle==1.1.10
-setuptools==49.2.0
+setuptools==50.3.0
 six==1.15.0
 toml==0.10.1
 typed-ast==1.4.1

3rdparty/python/requirements.txt

@@ -24,7 +24,7 @@ python-Levenshtein==0.12.0
 PyYAML>=5.3.1,<5.4
 requests[security]>=2.20.1
 setproctitle==1.1.10
-setuptools>=49.6.0,<49.7
+setuptools>=50.3.0,<50.4
 toml==0.10.1
 typed-ast>=1.4.1,<1.5
 typing-extensions==3.7.4.2

src/python/pants/backend/awslambda/python/lambdex.py

@@ -11,6 +11,6 @@ class Lambdex(PythonToolBase):
     default_version = "lambdex==0.1.3"
     # TODO(John Sirois): Remove when we can upgrade to a version of lambdex with
     # https://github.com/wickman/lambdex/issues/6 fixed.
-    default_extra_requirements = ["setuptools>=49.6.0,<49.7"]
+    default_extra_requirements = ["setuptools>=50.3.0,<50.4"]
     default_interpreter_constraints = ["CPython>=3.5"]
     default_entry_point = "lambdex.bin.lambdex"

src/python/pants/backend/python/subsystems/setuptools.py

@@ -10,5 +10,5 @@ class Setuptools(PythonToolBase):
     # NB: setuptools doesn't have an entrypoint, unlike most python tools.
     # We call it via a generated setup.py script.
     options_scope = "setuptools"
-    default_version = "setuptools>=49.6.0,<49.7"
-    default_extra_requirements = ["wheel==0.31.1"]
+    default_version = "setuptools>=50.3.0,<50.4"
+    default_extra_requirements = ["wheel==0.35.1"]