Revert "[CI] Try lowering max parallel link jobs on Windows (#185255)"

This reverts commit af22b50fac.

This seems to have had no noticeable effect on the frequency of failures
so likely was not the issue.

.ci/monolithic-windows.sh

@@ -48,8 +48,7 @@ cmake -S "${MONOREPO_ROOT}"/llvm -B "${BUILD_DIR}" \
       -D CMAKE_EXE_LINKER_FLAGS="/MANIFEST:NO" \
       -D CMAKE_MODULE_LINKER_FLAGS="/MANIFEST:NO" \
       -D CMAKE_SHARED_LINKER_FLAGS="/MANIFEST:NO" \
-      -D LLVM_ENABLE_RUNTIMES="${runtimes}" \
-      -D LLVM_PARALLEL_LINK_JOBS=16
+      -D LLVM_ENABLE_RUNTIMES="${runtimes}"
 
 start-group "ninja"