Merge branch 'stable-3.1' into stable-3.2

* stable-3.1:
  Bump Bazel version to 3.4.1
  Upgrade bazlets to latest stable-2.16

Change-Id: I411e2988ff23602c68cc46cdee01a4fb208796f5
diff --git a/.bazelversion b/.bazelversion
index fd2a018..47b322c 100644
--- a/.bazelversion
+++ b/.bazelversion
@@ -1 +1 @@
-3.1.0
+3.4.1