chore: Remove six and pathlib2 from deps (#4031)

Fixes: #3895 and #3892

bin/add-old-drafts-from-archive.py

@@ -4,7 +4,7 @@
 import datetime
 import os
 import sys
-from pathlib2 import Path
+from pathlib import Path
 from contextlib import closing
 
 os.environ["DJANGO_SETTINGS_MODULE"] = "ietf.settings"

debug.py

@@ -3,9 +3,7 @@ import os
 import sys
 import time as timeutils
 import inspect
-import six
-if six.PY3:
-    from typing import Callable
+from typing import Callable
 
 try:
     import syslog

ietf/utils/management/commands/populate_yang_model_dirs.py

@@ -7,7 +7,7 @@ import os
 import sys
 import time
 
-from pathlib2 import Path
+from pathlib import Path
 from textwrap import dedent
 from xym import xym
 

requirements.txt

@@ -41,7 +41,6 @@ mock>=4.0.3    # Used only by tests, of course
 mypy>=0.782,<0.790    # Version requirements determined by django-stubs.
 mysqlclient>=2.1.0
 oic>=1.3    # Used only by tests
-pathlib2>=2.3.7.post1
 Pillow>=9.1.0
 pyang>=2.5.3
 pyflakes>=2.4.0
@@ -57,7 +56,6 @@ requests-mock>=1.9.3
 rfc2html>=2.0.3
 scout-apm>=2.24.2
 selenium>=3.141.0,<4.0
-six>=1.16.0
 tblib>=1.7.0    # So that the django test runner provides tracebacks
 tlds>=2022042700    # Used to teach bleach about which TLDs currently exist
 tqdm>=4.64.0