[mlir] Fix -Wdeprecated-declarations in BufferResultsToOutParams.cpp …

…(NFC)

/llvm-project/mlir/lib/Dialect/Bufferization/Transforms/BufferResultsToOutParams.cpp:124:26:
error: 'cast' is deprecated: Use mlir::cast<U>() instead [-Werror,-Wdeprecated-declarations]
  124 |           orig.getType().cast<MemRefType>().hasStaticShape()) {
      |

mlir/lib/Dialect/Bufferization/Transforms/BufferResultsToOutParams.cpp

@@ -121,7 +121,7 @@ static LogicalResult updateReturnOps(func::FuncOp func,
     OpBuilder builder(op);
     for (auto [orig, arg] : llvm::zip(copyIntoOutParams, appendedEntryArgs)) {
       if (hoistStaticAllocs && isa<memref::AllocOp>(orig.getDefiningOp()) &&
-          orig.getType().cast<MemRefType>().hasStaticShape()) {
+          mlir::cast<MemRefType>(orig.getType()).hasStaticShape()) {
         orig.replaceAllUsesWith(arg);
         orig.getDefiningOp()->erase();
       } else {