3.0.8

Fixed symbolic links don't extract on macOS. #620
Search system for GTest before downloading. #654
Check that the whole entry has been read before checking CRC checksum in compat mode. #655
Close any open entry in unzOpenCurrentFile3 in compat mode. #655
Added missing include for FSCTL_GET_REPARSE_POINT on Windows. #656
Add liblzma library directory to pkgconfig. #658
Rewrite test certificates using more modern algorithms. #661
Allow CMake to handle optimization flags.
Disable MZ_SIGNING due to extra test requirements.
Upgrades to GitHub actions workflows.