Upgrade wiremock to 2.26.0

Change-Id: Iaddb64cf54e86f2363da409ddeda1fd7665cd75d
diff --git a/external_plugin_deps.bzl b/external_plugin_deps.bzl
index 2aecc68..9e7d7f7 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:2.25.1",
-        sha1 = "bf46d41a76c274522a8b88eb5b054edca630b089",
+        artifact = "com.github.tomakehurst:wiremock-standalone:2.26.0",
+        sha1 = "c0a192a3fd43b265ff4bc6014d64920d7c6e4174",
     )
 
     maven_jar(