[LLVM Utils] Update Certifi to 2023.5.7

Certifi 2022.12.07 removes root certificates from "TrustCor" from the
root store. These are in the process of being removed from Mozilla's
trust store.

https://groups.google.com/a/mozilla.org/g/dev-security-policy/c/oxX69KFvsm4/m/yLohoVqtCgAJ