add langchain4j 1.5.1

[hboutemy]

https://github.com/jvm-repo-rebuild/reproducible-central/blob/master/content/dev/langchain4j/README.md

[github-actions]

• dev.langchain4j:langchain4j 1.5.1

./rebuild.sh content/dev/langchain4j/langchain4j-1.5.1.buildspec
ko=1
Configured build command requires interactive shell:

command=SHELL mvn -ntp package -DskipTests -Dmaven.javadoc.skip -Dgpg.skip -Dspotless.skip

Run

git switch langchain4j-1.5.1
./rebuild.sh content/dev/langchain4j/langchain4j-1.5.1.buildspec

     ( ... interactive shell ... )

bin/update-project-summary.sh content/dev/langchain4j
git add content/dev/langchain4j
git commit -m './rebuild.sh content/dev/langchain4j/langchain4j-1.5.1.buildspec'
git push
gh pr merge -m