Fix the OpenPGP test with pdpdump 0.34
This fixes a regression from the last pgpdump update that changed the output a bit: https://github.com/kazu-yamamoto/pgpdump/commit/99a03b56de2a038cade5983cb0f2eb62fd26a0c1
Note: When merging this change the test will obviously break with older pgpdump versions. Feel free to close/replace this PR if you want to support pgpdump version 0.33 as well.
Edit: I just realized that this'll likely break CI so we'd have to support both versions.
Edited by Michael Weiss