Bump Bazel version to 3.7.0

Change-Id: I38ba67f7dc9920ce41497b26ca0b4d80c9bc0c3c
diff --git a/.bazelversion b/.bazelversion
index 1545d96..7c69a55 100644
--- a/.bazelversion
+++ b/.bazelversion
@@ -1 +1 @@
-3.5.0
+3.7.0