Bump externals/llvm-project from d92bf11 to 5520c5c

Bumps [externals/llvm-project](https://github.com/Xilinx/llvm-project) from `d92bf11` to `5520c5c`.
- [Commits](Xilinx/llvm-project@d92bf11...5520c5c)

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updated-dependencies:
- dependency-name: externals/llvm-project
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>