Fix build on python 2.7

Author: mayeut

scikit-ci.yml

@@ -125,16 +125,14 @@ test:
               if "MACOSX_DEPLOYMENT_TARGET" in os.environ:
                   target = tuple(int(p) for p in os.environ["MACOSX_DEPLOYMENT_TARGET"].split("."))
                   # let's add universal2 platform for this wheel.
-                  additional_platforms = [
-                      f"macosx_{target[0]}_{target[1]}_universal2",
-                  ]
+                  additional_platforms = ["macosx_{}_{}_universal2".format(*target)]
 
                   # given pip support for universal2 was added after arm64 introduction
                   # let's also add arm64 platform.
                   arm64_target = target
                   if arm64_target < (11, 0):
                       arm64_target = (11, 0)
-                  additional_platforms.append(f"macosx_{arm64_target[0]}_{arm64_target[1]}_arm64")
+                  additional_platforms.append("macosx_{}_{}_arm64".format(*arm64_target))
 
                   if target < (11, 0):
                       # They're were also issues with pip not picking up some universal2 wheels, tag twice