Update astroid to 2.5.3 in pylint-2.7 spec

These package versions have conflicting dependencies.
 The conflict is caused by:
     The user requested astroid==2.4.2
     pylint 2.7.4 depends on astroid<2.7 and >=2.5.2

Change-Id: Id2724413f18d1cb62a6cc9cb936edf26f245f621
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3224599
Auto-Submit: Chenlin Fan <fancl@chromium.org>
Reviewed-by: Robbie Iannucci <iannucci@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Commit-Queue: Dirk Pranke <dpranke@google.com>

pylint-2.7

@@ -55,7 +55,7 @@
 #
 # wheel: <
 #   name: "infra/python/wheels/astroid-py3"
-#   version: "version:2.4.2"
+#   version: "version:2.5.3"
 # >
 # wheel: <
 #   name: "infra/python/wheels/pylint-py3"