Remove `WORKSPACE` dependency on `pybind11_bazel`.
There is no dependency from `tensorflow_federated` to `pybind11_bazel`,
```
bazelisk query "somepath(//tensorflow_federated/...,
```
@@ -60,12 +60,6 @@ git_repository(
remote = "https://github.com/pybind/pybind11_abseil.git",
)
-git_repository(
- name = "pybind11_bazel",
- commit = "72cbbf1fbc830e487e3012862b7b720001b70672",
- remote = "https://github.com/pybind/pybind11_bazel.git",
-)
-
git_repository(
name = "pybind11_protobuf",
commit = "a3d93a93387af7fa57d72d56cfc0a4ba7f4a60e4",
