Use buildozer to remove deprecated automanaged tags

vendor/github.com/grpc-ecosystem/go-grpc-prometheus/BUILD

@@ -16,7 +16,6 @@ go_library(
         "server_reporter.go",
         "util.go",
     ],
-    tags = ["automanaged"],
     deps = [
         "//vendor/github.com/prometheus/client_golang/prometheus:go_default_library",
         "//vendor/golang.org/x/net/context:go_default_library",

vendor/github.com/grpc-ecosystem/grpc-gateway/runtime/BUILD

@@ -24,7 +24,6 @@ go_library(
         "proto2_convert.go",
         "query.go",
     ],
-    tags = ["automanaged"],
     deps = [
         "//vendor/github.com/golang/protobuf/jsonpb:go_default_library",
         "//vendor/github.com/golang/protobuf/proto:go_default_library",

vendor/github.com/grpc-ecosystem/grpc-gateway/runtime/internal/BUILD

@@ -10,7 +10,6 @@ load(
 go_library(
     name = "go_default_library",
     srcs = ["stream_chunk.pb.go"],
-    tags = ["automanaged"],
     deps = ["//vendor/github.com/golang/protobuf/proto:go_default_library"],
 )
 

vendor/github.com/grpc-ecosystem/grpc-gateway/utilities/BUILD

@@ -14,7 +14,6 @@ go_library(
         "pattern.go",
         "trie.go",
     ],
-    tags = ["automanaged"],
 )
 
 filegroup(