Updated Gemfile and Gemfile.lock for succefull 'bundle exec jekyll serve' execution #109
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With a new Version of ruby (ruby 3.0.2p107), it was not possible anymore to execute the command
bundle exec jekyll serve
.The changes in this PR shall change this issue, so that this command successfully starts jekyll again to serve the "Programming with Java"- website.
So before finishing this PR it would be nice if the Person reviewing this PR executes this command to check if it can now be executed sucessfully.