I'm afraid I'm coming at the situation from the other perspective; I would be very uncomfortable not telling a donor-conceived child about their genetic origins. For context, I'm single and currently 11w pregnant after double-donor IVF. My plan is very much to be open with the child from so early on that they're never aware of learning about it; hopefully it'll just be something they've always known.
It's a very personal thing, of course. But nowadays, there are so many ways for people to find out more about their genes, which I think is something to factor in. I would worry that it could create a rift in the relationship between parent and child, I'd that kind of information comes to light later in life and has been concealed.
Are you asking this as a single woman/someone in a same-sex relationship, or would this be in the context of a m/f relationship? I guess the other thing to factor in would be, if there's no male figure present and you don't explain the situation and just never talk about their biological father, what might a donor-conceived child infer from that? Some of the possibilities could be quite distressing, which I'm sure you'd want to avoid.
Personally, I think that as origin stories go, knowing that all the people involved in bringing you into being really wanted you to be in the world and went out of their way to make that happen is a pretty cool one. But for you right now, if this is something you're turning over, I'd recommend getting some counselling from someone specialist in this area. Fertility clinics usually provide access to this type of counselling. (I will say that I have come across people online who are leaning towards not telling, who felt that counselling pushed them towards considering the idea of telling, so for additional context I will also say that when I had this type of counselling as someone who does want to tell, the conversation included getting me to think about the option of not telling - it's very much the counsellor's job to get you to think about all possibilities, not that they're pushing one agenda.) What they can also do is help you to think through approaches and strategies and what you might want to say or not say in what circumstances - basically, help you to figure out your personal approach and what will work for you.
Best of luck!