Bump llvm-project from c6a666f to 62459f4

Bumps [llvm-project](https://github.com/Xilinx/llvm-project) from `c6a666f` to `62459f4`.
- [Commits](Xilinx/llvm-project@c6a666f...62459f4)

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

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