Support setuptools 68.0.0

In setuptools 68.0.0 deprecation warnings for pkg_resources are issued
with `stacklevel=2` so they belong to the calling module instead of
pkg_resources.

The deprecation warning we filter is reported on `setuptools.sandbox`.

We fix this, otherwise lots of doctests will fail.

Author: tornaria

src/sage/all__sagemath_repl.py

@@ -44,7 +44,7 @@
 warnings.filterwarnings('ignore', category=DeprecationWarning,
     message='pkg_resources is deprecated as an API|'
             'Deprecated call to `pkg_resources.declare_namespace(.*)`',
-    module='pkg_resources')
+    module='pkg_resources|setuptools.sandbox')
 warnings.filterwarnings('ignore', category=DeprecationWarning,
     message='msvccompiler is deprecated and slated to be removed',
     module='distutils.msvccompiler')