Upgrade guava to 27.1-jre

Change-Id: I8b8d48ee1398ea14b13cc348ce44569e5c6e882d
diff --git a/lib/guava.bzl b/lib/guava.bzl
index e4c9083..c36bf14 100644
--- a/lib/guava.bzl
+++ b/lib/guava.bzl
@@ -1,5 +1,5 @@
-GUAVA_VERSION = "27.0.1-jre"
+GUAVA_VERSION = "27.1-jre"
 
-GUAVA_BIN_SHA1 = "bd41a290787b5301e63929676d792c507bbc00ae"
+GUAVA_BIN_SHA1 = "e47b59c893079b87743cdcfb6f17ca95c08c592c"
 
 GUAVA_DOC_URL = "https://google.github.io/guava/releases/" + GUAVA_VERSION + "/api/docs/"