fix: Importing plugins from a user-specified installation directory

[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

fix: Wrong path replacement

[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

fix: typo

src/PIL/Image.py

@@ -355,10 +355,11 @@ def init():
     if _initialized >= 2:
         return 0
 
+    parent_module, _, _ = __name__.rpartition(".")
     for plugin in _plugins:
         try:
             logger.debug("Importing %s", plugin)
-            __import__(f"PIL.{plugin}", globals(), locals(), [])
+            __import__(f"{parent_module}.{plugin}", globals(), locals(), [])
         except ImportError as e:
             logger.debug("Image: failed to import %s: %s", plugin, e)