Fix source file reference

mypy/private/BUILD.bazel

diff --git a/mypy/private/BUILD.bazel b/mypy/private/BUILD.bazel
index 2bb426b..3014dfd 100644
--- a/mypy/private/BUILD.bazel
+++ b/mypy/private/BUILD.bazel
@@ -5,6 +5,10 @@
 load("@rules_uv//uv:venv.bzl", "create_venv")
 load(":mypy.bzl", "mypy_cli", _mypy = "mypy")
 
+exports_files([
+    "mypy.py",
+])
+
 bzl_library(
     name = "mypy_rules",
     srcs = ["mypy.bzl"],

mypy/private/mypy.bzl

diff --git a/mypy/private/mypy.bzl b/mypy/private/mypy.bzl
index 19f6437..994710a 100644
--- a/mypy/private/mypy.bzl
+++ b/mypy/private/mypy.bzl
@@ -125,8 +125,8 @@
 
     py_binary(
         name = name,
-        srcs = ["//mypy/private:mypy.py"],
-        main = "//mypy/private:mypy.py",
+        srcs = ["@rules_mypy//mypy/private:mypy.py"],
+        main = "@rules_mypy//mypy/private:mypy.py",
         visibility = ["//visibility:public"],
         deps = [
             mypy_requirement,