Upgrade protobuf to 3.19.6
Upgrade protobuf to 3.19.6

Due to a potential security issue in protobuf:
https://github.com/protocolbuffers/protobuf/security/advisories/GHSA-h4h5-3hr4-j3g2

RELNOTES: None
PiperOrigin-RevId: 480330624
Change-Id: I0e82cbd10283b146e100a6fdd0388ebeec8191f0

bazelbuild/bazel,katre/bazel,cushon/bazel,cushon/bazel,katre/bazel,cushon/bazel,katre/bazel,bazelbuild/bazel,bazelbuild/bazel,bazelbuild/bazel,cushon/bazel,bazelbuild/bazel,katre/bazel,katre/bazel,katre/bazel,cushon/bazel,bazelbuild/bazel,cushon/bazel