Work around pypa/pip#9450

See pypa/pip#10212

noxfile.py

@@ -286,7 +286,7 @@ def _upgrade_pip_setuptools_and_wheel(session):
         "install",
         "--progress-bar=off",
         "-U",
-        "pip>=20.2.4,<21.2",
+        "pip>=20.2.4",
         "setuptools!=50.*,!=51.*,!=52.*",
         "wheel",
     ]

salt/__init__.py

@@ -119,3 +119,6 @@ def __define_global_system_encoding_variable__():
 
 # This is now garbage collectable
 del __define_global_system_encoding_variable__
+
+# Import Salt's logging machinery
+import salt._logging.impl  # isort:skip  pylint: disable=unused-import

salt/_logging/impl.py

@@ -414,11 +414,22 @@ def makeRecord(
 # Override the python's logging logger class as soon as this module is imported
 if logging.getLoggerClass() is not SaltLoggingClass:
 
+    # Import pip._internal which itself will install it's own custom logging handler
+    # we want to override that handler with ours
+    try:
+        import pip._internal.utils._log as pip_log_module  # pylint: disable=no-name-in-module,import-error
+    except ImportError:
+        pip_log_module = None
+
     logging.setLoggerClass(SaltLoggingClass)
     logging.addLevelName(QUIET, "QUIET")
     logging.addLevelName(PROFILE, "PROFILE")
     logging.addLevelName(TRACE, "TRACE")
     logging.addLevelName(GARBAGE, "GARBAGE")
+    if pip_log_module is not None:
+        # Let's make newer versions of pip work by patching SaltLoggingClass to
+        # add a verbose method which is what pip expects
+        SaltLoggingClass.verbose = SaltLoggingClass.debug
 
     # ----- REMOVE ON REFACTORING COMPLETE -------------------------------------------------------------------------->
     if not logging.root.handlers: