scripts/ci: upgrade packaging stack

Make sure we have the newest versions of pip/setuptools/wheel as well in
requirements-tox.txt.

See #6068, needed to support the "cp310" tag when building wheels for
hunter/PyQt5-sip.

misc/requirements/requirements-tox.txt

@@ -4,10 +4,13 @@ appdirs==1.4.4
 distlib==0.3.1
 filelock==3.0.12
 packaging==20.8
+pip==21.0
 pluggy==0.13.1
 py==1.10.0
 pyparsing==2.4.7
+setuptools==52.0.0
 six==1.15.0
 toml==0.10.2
 tox==3.21.2
 virtualenv==20.4.0
+wheel==0.36.2

misc/requirements/requirements-tox.txt-raw

@@ -1 +1,2 @@
 tox
+wheel

scripts/dev/recompile_requirements.py

@@ -176,6 +176,9 @@ CHANGELOG_URLS = {
     'adblock': 'https://github.com/ArniDagur/python-adblock/blob/master/CHANGELOG.md',
     'importlib-resources': 'https://importlib-resources.readthedocs.io/en/latest/history.html',
     'dataclasses': 'https://github.com/ericvsmith/dataclasses#release-history',
+    'pip': 'https://pip.pypa.io/en/stable/news/',
+    'wheel': 'https://wheel.readthedocs.io/en/stable/news.html',
+    'setuptools': 'https://setuptools.readthedocs.io/en/latest/history.html',
 }
 
 
@@ -466,7 +469,8 @@ def build_requirements(name):
                   requirements=filename,
                   pre=comments['pre'])
         with utils.gha_group('Freezing requirements'):
-            proc = run_pip(tmpdir, 'freeze', stdout=subprocess.PIPE)
+            args = ['--all'] if name == 'tox' else []
+            proc = run_pip(tmpdir, 'freeze', *args, stdout=subprocess.PIPE)
             reqs = proc.stdout.decode('utf-8')
             if utils.ON_CI:
                 print(reqs.strip())