Remove flaky attribute from toolchain_test.

Ran test 1000 times, no failures.

PiperOrigin-RevId: 183828896
diff --git a/src/test/shell/bazel/BUILD b/src/test/shell/bazel/BUILD
index 67c140e..242c788 100644
--- a/src/test/shell/bazel/BUILD
+++ b/src/test/shell/bazel/BUILD
@@ -524,8 +524,6 @@
     size = "large",
     srcs = ["toolchain_test.sh"],
     data = [":test-deps"],
-    # TODO(b/70984583): remove when no longer flaky
-    flaky = 1,
     shard_count = 5,
 )