Bump Bazel version to 3.4.1

Change-Id: I772cc2b4abbbbec91686aa713e9b40a1e95352a0

.bazelversion

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