Bump Bazel version to 3.7.0

Change-Id: I1863175fd41aa569c506b1ea5f172e57b1d918b8
diff --git a/.bazelversion b/.bazelversion
index 1545d96..7c69a55 100644
--- a/.bazelversion
+++ b/.bazelversion
@@ -1 +1 @@
-3.5.0
+3.7.0