update cmake example project

[lesleyrs]

This stops a new cmake warning about file timestamps, and bump raylib version.

DOWNLOAD_EXTRACT_TIMESTAMP
New in version 3.24.

When specified with a true value, the timestamps of the extracted files will match those in the archive. When false, the timestamps of the extracted files will reflect the time at which the extraction was performed. If the download URL changes, timestamps based off those in the archive can result in dependent targets not being rebuilt when they potentially should have been. Therefore, unless the file timestamps are significant to the project in some way, use a false value for this option. If DOWNLOAD_EXTRACT_TIMESTAMP is not given, the default is false. See policy CMP0135.

[raysan5]

@lesleyrs thanks for the review! I always forget to update raylib version on CMake file...