Upgrade to Pex 2.1.34. (#11711) (#11713)

This pulls in fixes for missing `pex.bin` and problems encountered when
attempting to run venv pexes with Pex debugging turned up to level
three or higher.

Release notes: https:/pantsbuild/pex/releases/tag/v2.1.34

Fixes #11211
Fixes #11681

3rdparty/python/constraints.txt

@@ -1,4 +1,4 @@
-# Generated by build-support/bin/generate_lockfile.sh on Mon Mar  8 08:12:24 AM PST 2021
+# Generated by build-support/bin/generate_lockfile.sh on Tue Mar 16 06:41:23 PM PDT 2021
 ansicolors==1.1.8
 attrs==20.3.0
 beautifulsoup4==4.6.3
@@ -14,7 +14,7 @@ monotonic==1.5
 mypy==0.800
 mypy-extensions==0.4.3
 packaging==20.9
-pex==2.1.33
+pex==2.1.34
 pip==20.2.3
 pluggy==0.13.1
 psutil==5.7.0
@@ -33,4 +33,4 @@ six==1.15.0
 toml==0.10.2
 typed-ast==1.4.2
 typing-extensions==3.7.4.2
-urllib3==1.26.3
+urllib3==1.26.4

3rdparty/python/requirements.txt

@@ -15,7 +15,7 @@ mypy==0.800
 
 packaging==20.9
 pathspec==0.8.0
-pex==2.1.33
+pex==2.1.34
 psutil==5.7.0
 pystache==0.5.4
 # This should be kept in sync with `pytest.py`.

src/python/pants/backend/python/util_rules/pex_cli.py

@@ -37,7 +37,7 @@ class PexBinary(TemplatedExternalTool):
  name = "pex"
  help = "The PEX (Python EXecutable) tool (https:/pantsbuild/pex)."
 
- default_version = "v2.1.33"
+ default_version = "v2.1.34"
  default_url_template = "https:/pantsbuild/pex/releases/download/{version}/pex"
 
  @classproperty
@@ -47,8 +47,8 @@ def default_known_versions(cls):
  (
  cls.default_version,
  plat,
- "7f9f6168691fe83f38fbc248bd8629a152cf2a8833be1afdc06219f70fbb6064",
- "3596348",
+ "9b1a959ccb61b3deb64ffeed43a735c7115e414f4de6f96e66adc9e7fc7a757f",
+ "3597768",
  )
  )
  for plat in ["darwin", "linux"]