style: Sort imports

Discovered by ruff:

    staged_script/__init__.py:21:11: RUF022 [*] `__all__` is not sorted
       |
    19 |   )
    20 |
    21 |   __all__ = [
       |  ___________^
    22 | |     "StagedScript",
    23 | |     "HelpFormatter",
    24 | |     "RetryStage",
    25 | |     "StageDuration",
    26 | | ]
       | |_^ RUF022
    27 |   __version__ = "2.0.0"
       |
       = help: Apply an isort-style sorting to `__all__`

staged_script/__init__.py

@@ -12,16 +12,16 @@
 # SPDX-License-Identifier: BSD-3-Clause
 
 from .staged_script import (
-    StagedScript,
     HelpFormatter,
     RetryStage,
     StageDuration,
+    StagedScript,
 )
 
 __all__ = [
-    "StagedScript",
     "HelpFormatter",
     "RetryStage",
     "StageDuration",
+    "StagedScript",
 ]
 __version__ = "2.0.0"