Update dependencies

Among others, this updates minio-go, so that the new "eu-west-3" zone
for AWS is supported.

vendor/cloud.google.com/go/firestore/testdata/update-del-nested.textproto

@@ -0,0 +1,11 @@
+# DO NOT MODIFY. This file was generated by
+# github.com/GoogleCloudPlatform/google-cloud-common/testing/firestore/cmd/generate-firestore-tests/generate-firestore-tests.go.
+
+# The Delete sentinel must be the value of a top-level key.
+
+description: "update: Delete cannot be nested"
+update: <
+  doc_ref_path: "projects/projectID/databases/(default)/documents/C/d"
+  json_data: "{\"a\": {\"b\": \"Delete\"}}"
+  is_error: true
+>