Update rules_proto digest to e51f588
diff --git a/WORKSPACE b/WORKSPACE
index bdf54b2..8550fce 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -67,11 +67,11 @@
 
 http_archive(
     name = "rules_proto",
-    sha256 = "9eba2da1a7ed60c300ca19640801bcb591c6e332424199e7b23ebca7baf93c87",
-    strip_prefix = "rules_proto-33aba33e1bec7e75487676c792e5690937933ab7",
+    sha256 = "9a0503631679e9ab4e27d891ea60fee3e86a85654ea2048cae25516171dd260e",
+    strip_prefix = "rules_proto-e51f588e5932966ab9e63e0b0f6de6f740cf04c4",
     urls = [
-        "https://mirror.bazel.build/github.com/bazelbuild/rules_proto/archive/33aba33e1bec7e75487676c792e5690937933ab7.tar.gz",
-        "https://github.com/bazelbuild/rules_proto/archive/33aba33e1bec7e75487676c792e5690937933ab7.tar.gz",
+        "https://mirror.bazel.build/github.com/bazelbuild/rules_proto/archive/e51f588e5932966ab9e63e0b0f6de6f740cf04c4.tar.gz",
+        "https://github.com/bazelbuild/rules_proto/archive/e51f588e5932966ab9e63e0b0f6de6f740cf04c4.tar.gz",
     ],
 )