[bazel] Enable networking for tests on RBE.
[bazel] Enable networking for tests on RBE.

Also, update the bazel-toolchains repository after the Bazel 4.0.0 release.

Bug: skia:11111
Change-Id: I930d49566c1fbf4715919b906bfafc5a0f9474e6
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/360976
Commit-Queue: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>
Reviewed-by: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot