Update main.py

llvm/llvm-project#123181 replaces `nocapture` with `capture(none)`, which causes a problem for chess. For example https://github.com/Xilinx/mlir-aie/actions/runs/13077904662/job/36494451051

Author: fifield

python/compiler/aiecc/main.py

@@ -384,6 +384,7 @@ def downgrade_ir_for_chess(llvmir_chesslinked):
             "memory(argmem: write, inaccessiblemem: write)",
             "inaccessiblemem_or_argmemonly writeonly",
         )
+        .replace("captures(none)", "nocapture")
     )
     return llvmir_chesslinked