Bump llvm-project from 9d48ee6 to 81b017a

Bumps [llvm-project](https://github.com/Xilinx/llvm-project) from `9d48ee6` to `81b017a`.
- [Commits](Xilinx/llvm-project@9d48ee6...81b017a)

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

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