Bump externals/llvm-project from ecad3c5 to f713706

Bumps [externals/llvm-project](https://github.com/Xilinx/llvm-project) from `ecad3c5` to `f713706`.
- [Commits](Xilinx/llvm-project@ecad3c5...f713706)

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

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