specify timeout for gazelle manifest test (#817)

Fixes https://github.com/bazelbuild/rules_python/issues/802

Co-authored-by: Thulio Ferraz Assis <3149049+f0rmiga@users.noreply.github.com>

gazelle/manifest/defs.bzl

diff --git a/gazelle/manifest/defs.bzl b/gazelle/manifest/defs.bzl
index bbcda72..8439319 100644
--- a/gazelle/manifest/defs.bzl
+++ b/gazelle/manifest/defs.bzl
@@ -88,6 +88,7 @@
             "_TEST_REQUIREMENTS": "$(rootpath {})".format(requirements),
         },
         visibility = ["//visibility:private"],
+        timeout = "short",
     )
 
     native.filegroup(