[llvm] [bazel] Update to 7.x (PR #86297)

[Keith Smiley via llvm-commits]

keith wrote:

thanks for linking, merged a revert here to unblock https://github.com/llvm/llvm-project/pull/86325

do you know if there is a way I can run those CI jobs on my change? on my linux x86 machine with your command I don't see the same issue

https://github.com/llvm/llvm-project/pull/86297