Increase update test size from small to medium

Increase test size to avoid timeout for update tests:

//javatests/com/google/gerrit/server/update:small_tests TIMEOUT in 61.2s

Release-Notes: skip
Change-Id: I222bfcaaa908557a1acd6b20f5a4c43a1ad9b4b4
diff --git a/javatests/com/google/gerrit/server/update/BUILD b/javatests/com/google/gerrit/server/update/BUILD
index 4fe4ab04..6d96c10 100644
--- a/javatests/com/google/gerrit/server/update/BUILD
+++ b/javatests/com/google/gerrit/server/update/BUILD
@@ -1,8 +1,8 @@
 load("//tools/bzl:junit.bzl", "junit_tests")
 
 junit_tests(
-    name = "small_tests",
-    size = "small",
+    name = "update_tests",
+    size = "medium",
     srcs = glob(["*.java"]),
     runtime_deps = [
         "//java/com/google/gerrit/lucene",