infrastructure: Stricter tox dependensies (#8119)

.github/workflows/main.yml

@@ -165,7 +165,10 @@ jobs:
       with:
         path: ~/.cache/pre-commit
         key: pre-commit|${{ env.PY }}|${{ hashFiles('.pre-commit-config.yaml') }}
-    - run: pip install tox
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install tox
     - run: tox -e linting
 
   deploy:

setup.cfg

@@ -42,7 +42,7 @@ install_requires =
     attrs>=19.2.0
     iniconfig
     packaging
-    pluggy>=0.12,<1.0
+    pluggy>=0.12,<1.0.0a1
     py>=1.8.2
     toml
     atomicwrites>=1.0;sys_platform=="win32"
@@ -52,8 +52,8 @@ python_requires = >=3.6
 package_dir =
     =src
 setup_requires =
-    setuptools>=40.0
-    setuptools-scm
+    setuptools>=>=42.0
+    setuptools-scm>=3.4
 zip_safe = no
 
 [options.entry_points]

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 isolated_build = True
-minversion = 3.5.3
+minversion = 3.20.0
 distshare = {homedir}/.tox/distshare
 # make sure to update environment list in travis.yml and appveyor.yml
 envlist =
@@ -16,6 +16,7 @@ envlist =
     py37-freeze
     docs
     docs-checklinks
+requires = pip >= 20.3.1
 
 [testenv]
 commands =
@@ -44,19 +45,20 @@ setenv =
 extras = testing
 deps =
     doctesting: PyYAML
-    numpy: numpy
-    pexpect: pexpect
+    numpy: numpy>=1.19.4
+    pexpect: pexpect>=4.8.0
     pluggymaster: git+https://github.com/pytest-dev/pluggy.git@master
-    pygments
+    pygments>=2.7.2
     unittestextras: twisted
     unittestextras: asynctest
-    xdist: pytest-xdist>=1.13
+    xdist: pytest-xdist>=2.1.0
+    xdist: -e .
     {env:_PYTEST_TOX_EXTRA_DEP:}
 
 [testenv:linting]
 skip_install = True
 basepython = python3
-deps = pre-commit>=1.11.0
+deps = pre-commit>=2.9.3
 commands = pre-commit run --all-files --show-diff-on-failure {posargs:}
 
 [testenv:docs]
@@ -141,7 +143,7 @@ passenv = *
 deps =
     colorama
     github3.py
-    pre-commit>=1.11.0
+    pre-commit>=2.9.3
     wheel
     towncrier
 commands = python scripts/release.py {posargs}