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We have shared libraries and maven plugins setup. This is a situation where I really wish we used a monorepo and I could just do one commit across 100 microservices using grep and other tools to update pom.xml files. I have read whitepapers from google on how they support this kind of operation, but I need it for many git repos.

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This sounds like StackOverflow question. Anyway, if you're proficient in Java, why don't you write small app which will iterate over all Git repo dirs, modifies the files, makes commit, push and creates PRs? Not a big deal, right?

That is the current plan, combined with plenty of manual work verifying jenkins jobs and deployments.

If you can do it if there was just one repo, then juat clone those 100 repos under the same parent directory and execute the script in the parent directory

and then in a loop commit the changes

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