run.sh in fluent-plugin-formatter-protobuf-0.5.0

- old
+ new

@@ -7,6 +7,6 @@
 docker run -it --rm \
   -v "${PWD}:/opt/fluent-plugin-formatter-protobuf/" \
   -w '/opt/fluent-plugin-formatter-protobuf/' \
   -e OUT_FILE="./out" \
   -p 5170:5170 \
-  ruby:2.7.1 sh -c 'bundle install && fluentd -c /opt/fluent-plugin-formatter-protobuf/fluent.conf'
+  ruby:3.0.1 sh -c 'bundle install && fluentd -c /opt/fluent-plugin-formatter-protobuf/fluent.conf'
\ No newline at end of file