[bazel] Remove a duplicated dep

Author: hokein

utils/bazel/llvm-project-overlay/mlir/test/BUILD.bazel

@@ -684,7 +684,6 @@ cc_library(
     srcs = glob(["lib/Conversion/ConvertToSPIRV/*.cpp"]),
     deps = [
         "//mlir:ArithDialect",
-        "//mlir:UBDialect",
         "//mlir:FuncDialect",
         "//mlir:Pass",
         "//mlir:SPIRVConversion",