[Merged by Bors] - Update LLVM version to 15.0 in CI workflows #4220
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Issue Addressed
The latest stable version (1.69.0) of Rust was released on 20 April and contains this change:
This impacts some of our CI workflows (build and release-test-windows) that uses LLVM 13.0. This PR updates the workflows to install LLVM 15.0.
UPDATE: Also updated
h2
to address this issue