FYI, they did not spend over the cap but rather did not fill the paperwork correctly or on time:
"The CCA [Cost Cap Administration] confirms that although Alpine Racing SAS and HRC [Honda Racing Corporation] have both been found to be in procedural breach, neither have exceeded the cost cap level," the FIA said in a statement.
The procedural breaches were not detailed but could refer to late submissions of documents or errors in the documentation provided.
(Emphasis mine)