Sort __all__ alphabetically (RUF022)

Apply isort-style sorting to the package's __all__ list. Pure
cosmetic; no behaviour change.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: antoineleclair

src/dqliteclient/__init__.py

@@ -33,10 +33,6 @@
 __version__ = "0.1.3"
 
 __all__ = [
-    "__version__",
-    "allowlist_policy",
-    "connect",
-    "create_pool",
     "ClusterClient",
     "ClusterError",
     "ClusterPolicyError",
@@ -52,6 +48,10 @@
     "OperationalError",
     "ProtocolError",
     "RedirectPolicy",
+    "__version__",
+    "allowlist_policy",
+    "connect",
+    "create_pool",
 ]