feat(deps): conditional dependency

Only install `stdlib_list` for python versions up to 3.9.

From 3.10 onwards there is a way to get that from within python standard
lib.

setup.py

@@ -57,7 +57,7 @@ def read(filename):
     zip_safe=False,
     install_requires=[
         'setuptools',
-        'stdlib-list',
+        'stdlib-list; python_version < "3.10"',
         'cached-property',
         'toml',
     ],

z3c/dependencychecker/db.py

@@ -1,13 +1,18 @@
 import logging
 import sys
 
-from stdlib_list import stdlib_list
-
 from z3c.dependencychecker.dotted_name import DottedName
 
 logger = logging.getLogger(__name__)
 
 
+# starting from python 3.10 the list of builtin methods are available directly
+PY_10_OR_HIGHER = True
+if sys.version_info[1] < 10:
+    PY_10_OR_HIGHER = False
+    from stdlib_list import stdlib_list
+
+
 class ImportsDatabase:
     """Store all imports and requirements of a package
 
@@ -349,13 +354,19 @@ def _discard_if_found_obj_in_list(obj, obj_list):
 
     @staticmethod
     def _build_std_library():
-        python_version = sys.version_info
-        libraries = stdlib_list(
-            '{}.{}'.format(
-                python_version[0],
-                python_version[1],
+        if PY_10_OR_HIGHER:
+            # see https://github.com/jackmaney/python-stdlib-list/issues/55
+            libraries = list(
+                set(list(sys.stdlib_module_names) + list(sys.builtin_module_names))
+            )
+        else:
+            python_version = sys.version_info
+            libraries = stdlib_list(
+                '{}.{}'.format(
+                    python_version[0],
+                    python_version[1],
+                )
             )
-        )
 
         fake_std_libraries = [DottedName(x) for x in libraries]
         return fake_std_libraries