fix: gem-update to work without using local bundle

gem-update.sh

@@ -2,9 +2,9 @@
 cd "$(dirname "$0")"
 set -ex
 docker run --rm -it -v "$(pwd)":/app \
-  -v /usr/local/bundle:/usr/local/bundle ruby:3.2.2-slim-bullseye sh \
+  ruby:3.2.2-slim-bullseye sh \
   -c "apt-get update; \
-      apt-get install -y cmake build-essential; \
+      apt-get install -y cmake build-essential ruby-dev libpq-dev default-libmysqlclient-dev; \
       cd /app; \
       gem install --default bundler:2.4.12; \
       gem update --system; \