qpdf: 7.1.1 -> 8.0.0

Semi-automatic update. These checks were done:

- built on NixOS
- ran `/nix/store/788zbmljyhaj8y93k7q5lqpah0c9pcz0-qpdf-8.0.0/bin/fix-qdf --version` and found version 8.0.0
- ran `/nix/store/788zbmljyhaj8y93k7q5lqpah0c9pcz0-qpdf-8.0.0/bin/qpdf --help` got 0 exit code
- ran `/nix/store/788zbmljyhaj8y93k7q5lqpah0c9pcz0-qpdf-8.0.0/bin/qpdf --version` and found version 8.0.0
- found 8.0.0 with grep in /nix/store/788zbmljyhaj8y93k7q5lqpah0c9pcz0-qpdf-8.0.0
- found 8.0.0 in filename of file in /nix/store/788zbmljyhaj8y93k7q5lqpah0c9pcz0-qpdf-8.0.0