No, there won't.
Why?
1) If the Germans are not in on it (and it's hard to imagine they would let Trump take the servers if they were), then that means that they would allow the Americans to come in and do what they want to do. Especially if they had legal authority to do so. And if they even had an idea of what was going on, they don't want to be the ones backing the wrong side. So they take no sides. And they can always say afterwards "Well, whoever did this got what they deserved".
2) This all comes down to German interests. Germany's interests are better served by having Biden in the White House. That's true. So you might have people in Germany willing to help Biden cheat, assuming anyone would bother to tell them. But if Biden gets caught, the Germans are not going to be eager to risk backing any side. Because if the side they back loses, then the Germans are going to be blamed for it. You think Russia-Gate was bad PR for Russia? Imagine finding a server in Germany after having associated that with election fraud and Germany trying to stop Trump from getting it. Those US bases would be empty by February if Trump had to fly there himself and scream in a megaphone to every US soldier to pack their shit up and go home.
3) It would only heighten paranoia about Germany's vulnerability to the USA. Merkel has to at least be able to say "Well, we let them do it". Her coming out and saying "The USA basically does whatever the fuck it wants, get used to it", the German people will be furious and demand the US leave because they would feel mistreated.
4) As
Zachowon mentioned, this was probably done with full German approval. The US, even under Trump, does not want to run roughshod over a sovereign nation unless it feels it has to. And if the Germans weren't in on it, they aren't going to be happy that a bunch of US politicians PLANTED A DIRTY VOTING SEVER IN THEIR COUNTRY. Even if they were in on it, the Germans are NOT going to want to take responsibility for it. Even if it's a hushed understanding between Trump and Merkel of "Hey, I knew what they were doing, but I let you catch them"
There are so many reasons why Germany is not going to want to raise a fuss, it's hard to pick one.