fix typo

Author: Mizux

build_defs.bzl

@@ -76,7 +76,7 @@ def pybind_extension(
         linkshared = 1,
         tags = tags,
         target_compatible_with = select({
-            "@platform//os:windows": ["@platforms//:incompatible"],
+            "@platforms//os:windows": ["@platforms//:incompatible"],
             "//conditions:default": [],
         }),
         deps = deps + PYBIND_DEPS,
@@ -98,7 +98,7 @@ def pybind_extension(
         linkshared = 1,
         tags = tags,
         target_compatible_with = select({
-            "@platform//os:windows": [],
+            "@platforms//os:windows": [],
             "//conditions:default": ["@platforms//:incompatible"],
         }),
         deps = deps + PYBIND_DEPS,