Thank you for your interest in Bitnami. We are working on updating Apache to 2.4.35. Once we finish, all the assets we release will include this version of the component but we do not force the release of all of them. So we will release a new version of our LAMP stack in case there is a new version of PHP or there is a major change in the LAMP installer, if not, we perform a maintenance release within a month.
I hope this information helps.