fix: remove references to imp in untouched code

CI runs flake8 to check for syntax errors and it threw errors on old
imp.XYZ code that was not actually called.

It looks like the code was only called when resolving modules like
ssl, _ssl, importlib, importlib.resources .. rather than
files/directory paths. In Roundup's use case it only runs over
files/directories.

roundup/pygettext.py

@@ -269,35 +269,13 @@ def _get_modpkg_path(dotted_name, pathlist=None):
     a package. Return None if the name is not found, or is a builtin or
     extension module.
     """
-    # split off top-most name
-    parts = dotted_name.split('.', 1)
-
-    if len(parts) > 1:
-        # we have a dotted path, import top-level package
-        try:
-            file, pathname, description = importlib.find_module(parts[0], pathlist)
-            if file: file.close()
-        except ImportError:
-            return None
-
-        # check if it's indeed a package
-        if description[2] == imp.PKG_DIRECTORY:
-            # recursively handle the remaining name parts
-            pathname = _get_modpkg_path(parts[1], [pathname])
-        else:
-            pathname = None
-    else:
-        # plain name
-        try:
-            file, pathname, description = imp.find_module(
-                dotted_name, pathlist)
-            if file:
-                file.close()
-            if description[2] not in [imp.PY_SOURCE, imp.PKG_DIRECTORY]:
-                pathname = None
-        except ImportError:
-            pathname = None
+    pathname = None
+    r =  importlib.util.find_spec(dotted_name, pathlist)
 
+    if r.loader.is_package(dotted_name):
+        pathname = r.submodule_search_locations[0]
+    elif issubclass(r.loader.__class__,(importlib.abc.SourceLoader)):
+        pathname = r.origin
     return pathname
 
 
@@ -325,8 +303,7 @@ def getFilesForName(name):
         # get extension for python source files
         if '_py_ext' not in globals():
             global _py_ext
-            _py_ext = [triple[0] for triple in imp.get_suffixes()
-                       if triple[2] == imp.PY_SOURCE][0]
+            _py_ext = importlib.machinery.SOURCE_SUFFIXES
         for root, dirs, files in os.walk(name):
             # don't recurse into CVS directories
             if 'CVS' in dirs: