For the last few years, the Technical Certification Program has adopted certification versions tied to Calendar Year (rather than Product versions). Esri considers updating the certification(s) every 18-24 months. I would suggest to go for the latest one (Esri ArcGIS Pro Foundation 2101), even if there is no substantial change in content (Not much has changed in ArcGIS Pro at foundational level functionalities in last couple of years).
Think Location