Update membership prospectus to 2025-04 version
Some small changes were made to most of the slides in the membership prospectus. Please update the PDF at this link with the slide deck below, and update the HTML content at https://www.eclipse.org/membership/prospectus/.
Note that the new prospectus has a new page called "Enabling Business-Friendly Open Source," which means we'd need to add a new section to the HTML version.