### What does this PR do? Updating Semgrep.yml file - Semgrep is a tool that will be used to scan Cloudflare's public repos for Supply chain, code and secrets. This work is part of Application & Product Security team's initiative to onboard Semgrep onto all of Cloudflare's public repos. In case of any questions, please reach out to "Hrushikesh Deshpande" on cf internal chat. ### What issues does this PR fix or reference? It is to update the Semgrep yaml file to run the latest version of ubuntu and run actions on v4.
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