Support Exiv2 0.28+
Use the new types for the image pointer as available in the new Exiv2 version, keeping the support for older versions.
Fixes #204
The 17.0 major release is coming on May 16, 2024! This version brings many exciting improvements to GitLab, but also removes some deprecated features. We are introducing three breaking change windows during which we expect breaking changes to be deployed to GitLab.com. You can read more about it on our blogpost. The second breaking change window begins 2024-04-29 09:00 UTC and ends 2024-05-01 22:00 UTC.
Use the new types for the image pointer as available in the new Exiv2 version, keeping the support for older versions.
Fixes #204