Bump Bazel version to 3.4.1

Change-Id: I67de52a9cb8bf94f3bf5741d7c99f72c1d7dd2b4

.bazelversion

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