fix(sandbox): add remove_dir permissions to sandbox

When an extraction directory is empty, unblob will try to delete it.

This can lead to PermissionError due to insufficient permissions within
the sandbox.

unblob/sandbox.py

@@ -47,6 +47,7 @@ def __init__(
             AccessFS.read_write("/dev/shm"),  # noqa: S108
             # Extracted contents
             AccessFS.read_write(config.extract_root),
+            AccessFS.remove_dir(config.extract_root),
             AccessFS.make_dir(config.extract_root.parent),
             AccessFS.read_write(log_path),
             *extra_passthrough,