Remove unused proto import

This should've been removed when we changed
the example type.

Author: johanbrandhorst

protoc-gen-openapiv2/options/BUILD.bazel

@@ -25,7 +25,6 @@ proto_library(
         "openapiv2.proto",
     ],
     deps = [
-        "@com_google_protobuf//:any_proto",
         "@com_google_protobuf//:descriptor_proto",
         "@com_google_protobuf//:struct_proto",
     ],