Upgrade wiremock to 2.27.0

Change-Id: I27401e80d720962545469d961994c9e7b6688d7a

external_plugin_deps.bzl

diff --git a/external_plugin_deps.bzl b/external_plugin_deps.bzl
index ca33b60..754ccab 100644
--- a/external_plugin_deps.bzl
+++ b/external_plugin_deps.bzl
@@ -3,8 +3,8 @@
 def external_plugin_deps():
     maven_jar(
         name = "wiremock",
-        artifact = "com.github.tomakehurst:wiremock-standalone:2.26.3",
-        sha1 = "245c6efae2cbcb4e4f3457caf3d1c030cbaf2eb5",
+        artifact = "com.github.tomakehurst:wiremock-standalone:2.27.0",
+        sha1 = "d869289b3f9380769aaac4993e240ab37b09098e",
     )
 
     maven_jar(