fix linter

Author: Erotemic

cibuildwheel/oci_container.py

@@ -53,9 +53,9 @@ def current(cls):
         }
         try:
             return mapping[arch]
-        except KeyError:
+        except KeyError as ex:
             msg = f"Unsupported platform architecture: {arch}"
-            raise OSError(msg)
+            raise OSError(msg) from ex
 
 
 @dataclasses.dataclass(frozen=True)