fix(deps): update dependency sphinx to v6

pyproject.toml

@@ -81,6 +81,9 @@ flatten-dict = "*"
 dpath = "*"
 furl = "*"
 StrEnum = "*"
+# To avoid this error on python3.7: AttributeError: 'EntryPoints' object has no attribute 'get'
+# https://importlib-metadata.readthedocs.io/en/latest/history.html#v5-0-0
+importlib-metadata = {version = "<5.0", python = "<3.8"}
 
 # TODO: chore: move to dependency groups once the feature is on a stable version of Poetry
 #  https://python-poetry.org/docs/master/managing-dependencies/#dependency-groups

tests/test_plugin.py

@@ -2,6 +2,8 @@
 import os
 from enum import Enum
 
+import flake8
+import pytest
 import responses
 from flake8.main import cli
 
@@ -20,18 +22,22 @@ def _call_main(argv, retv=0):
     Copied from:
     https://github.com/PyCQA/flake8/blame/5a85dd8ddb2dbd3027415594160c40e63b9b44e5/tests/integration/test_main.py#L13-L16
     """
-    # Since 5.0.0, flake8 is returning an exit code instead of raising SystemExit
-    # https://github.com/PyCQA/flake8/commit/81a4110338496714c0bf2bb0e8dd929461d9d492
-
-    # This change only affects nitpick's tests, not its code.
-    # No need to pin flake8 on pyproject.toml;
-    # nitpick uses a recent flake8 on poetry.lock
-    # but won't enforce the new version
-    # and will still work if the developer has an older flake8 version
-
-    # This is how flake8 tests the exit code nowadays:
-    # https://github.com/PyCQA/flake8/blob/45699b61ae4522864c60480c80d7c2ffb952d52e/tests/integration/test_main.py#L28
-    assert cli.main(argv) == retv
+    if flake8.__version_info__ < (5, 0, 0):
+        # Since 5.0.0, flake8 is returning an exit code instead of raising SystemExit
+        # https://github.com/PyCQA/flake8/commit/81a4110338496714c0bf2bb0e8dd929461d9d492
+
+        # This change only affects nitpick's tests, not its code.
+        # No need to pin flake8 on pyproject.toml;
+        # nitpick uses a recent flake8 on poetry.lock
+        # but won't enforce the new version
+        # and will still work if the developer has an older flake8 version
+        with pytest.raises(SystemExit) as excinfo:
+            cli.main(argv)
+        assert excinfo.value.code == retv
+    else:
+        # This is how flake8 tests the exit code nowadays:
+        # https://github.com/PyCQA/flake8/blob/45699b61ae4522864c60480c80d7c2ffb952d52e/tests/integration/test_main.py#L28
+        assert cli.main(argv) == retv
 
 
 def test_absent_files(tmp_path):