Bump LLVM to get bazel fixes (#2517)

The last llvm bump in #2511
pointed to
llvm/llvm-project@b44b349,
however the bazel build upstream was not clean at this point:

```
ERROR: /root/.cache/bazel/_bazel_root/b89349c08f7224396763d14fe35cba11/external/llvm-project/mlir/BUILD.bazel:5837:18: TdGenerate
external/llvm-project/mlir/include/mlir/Dialect/LLVMIR/NVVMOpsInterface.h.inc failed: (Exit 1): mlir-tblgen failed: error executing command ...
                                                                                                                                                    
external/llvm-project/mlir/include/mlir/Dialect/LLVMIR/NVVMOps.td:20:9: error: Could not find include file 'mlir/Dialect/LLVMIR/BasicPtxBuilderInterface.td'                                                                                                           
include "mlir/Dialect/LLVMIR/BasicPtxBuilderInterface.td"                                                                                                                                                                                                              
        ^                                                                                                                                                                                                                                                              
external/llvm-project/mlir/include/mlir/Dialect/LLVMIR/NVVMOps.td:20:9: error: Unexpected token at top level                                                                                                                                                           
include "mlir/Dialect/LLVMIR/BasicPtxBuilderInterface.td"                                                                                                                                                                                                              
        ^       
```

The bazel fixes followed in a subsequent commit at
llvm/llvm-project@28b27c1.
This PR bumps LLVM by a few more commits (to include the bazel fixes)
which helps restore Torch-MLIR's bazel build back to 🟢 .

GHA workflow to test bazel build:
https://github.com/sjain-stanford/torch-mlir/actions/runs/6555101471/job/17803082508