Merge pull request #8 from DataDog/tonycthsu/rubygem-3.5.21

Update rubygem for ruby 3.2

Author: TonyCTHsu

src/engines/ruby/3.2/Dockerfile

@@ -54,7 +54,7 @@ RUN mkdir -p "$GEM_HOME" "$BUNDLE_BIN" \
  && chmod 777 "$GEM_HOME" "$BUNDLE_BIN"
 
 ## Install a pinned RubyGems and Bundler
-RUN gem update --system 3.3.26
+RUN gem update --system 3.5.21
 RUN gem install bundler:2.3.26
 
 # Install additional gems that are in CRuby but missing from the above