Merge branch 'stable-3.0' into stable-3.1

* stable-3.0:
  Bump Bazel version to 3.4.1
  Upgrade bazlets to latest stable-2.16

Change-Id: Id33b768be67e801466f1530244e54469d6f285a3

.bazelversion

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