Catch BaseException for resource cleanup handlers

In the event of a SystemExit or KeyboardInterrupt, file resources should
still be cleaned up before re-raising the exception.

https://docs.python.org/3/library/exceptions.html#exception-hierarchy

src/PIL/Image.py

@@ -2663,7 +2663,7 @@ def open(fp, mode="r"):
                 # opening failures that are entirely expected.
                 # logger.debug("", exc_info=True)
                 continue
-            except Exception:
+            except BaseException:
                 if exclusive_fp:
                     fp.close()
                 raise