Merge branch 'stable-5.6' into stable-5.7

* stable-5.6:
  Bump Bazel version to 3.1.0

Change-Id: I8a9f39370ab506d9ff5763ed2d05f0d970bbd10b
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
diff --git a/.bazelversion b/.bazelversion
index 4a36342..fd2a018 100644
--- a/.bazelversion
+++ b/.bazelversion
@@ -1 +1 @@
-3.0.0
+3.1.0