style: remove from future import annotations

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

cibuildwheel/oci_container.py

@@ -1,5 +1,3 @@
-from __future__ import annotations
-
 import io
 import json
 import os
@@ -44,8 +42,8 @@ class OCIContainerEngineConfig:
     create_args: tuple[str, ...] = field(default_factory=tuple)
     disable_host_mount: bool = False
 
-    @staticmethod
-    def from_config_string(config_string: str) -> OCIContainerEngineConfig:
+    @classmethod
+    def from_config_string(cls, config_string: str) -> Self:
         config_dict = parse_key_value_string(
             config_string,
             ["name"],
@@ -75,9 +73,7 @@ class OCIContainerEngineConfig:
             else:
                 create_args = [arg for arg in create_args if not arg.startswith("--platform=")]
 
-        return OCIContainerEngineConfig(
-            name=name, create_args=tuple(create_args), disable_host_mount=disable_host_mount
-        )
+        return cls(name=name, create_args=tuple(create_args), disable_host_mount=disable_host_mount)
 
     def options_summary(self) -> str | dict[str, str]:
         if not self.create_args: