Release 3.4.1 (2020-07-14)

Baseline: 7404d17

Cherry picks:

• f31f2d7:
  fixup! Gracefully handle the lack of subreaper support in Linux.
• 3a4f221:
  Revert "Replace the remaining dependencies for Bazel Debian
  build (third_party)"
• c55ec0f:
  Revert "Upgrade gRPC to 1.26.0"

This patch release fixes #11756

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