Update bazel-toolchains pin (#168)
Update bazel-toolchains pin (#168)

This fixed Bazel CI failures (bazelbuild/bazel#6742) such as https://buildkite.com/bazel/bazel-with-downstream-projects-bazel/builds/613#820af988-4113-421f-b3f1-cef2f05d272c
bazelbuild/rules_kotlin,bazelbuild/rules_kotlin,bazelbuild/rules_kotlin,bazelbuild/rules_kotlin