bug#58301: Small epg fix and a test suite cleanup

[Justus Winter]

Moin,

this is a patch series that improves and simplifies how epg verifies
signatures, and replaces aging OpenPGP artifacts in the test suite.

This replaces the old OpenPGPv4 keys that are used in the test suite
with more modern OpenPGPv4 keys.  All cryptographic artifacts in the
test suite are updated accordingly.

Having old cryptographic artifacts in the test suite presents a
problem once the old algorithms are rejected by contemporary
implementations.

Best,
Justus

0001-Fix-epg-s-reliance-on-an-implicit-GnuPG-command.patch
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0002-Replace-aging-OpenPGP-artifacts-in-the-epg-tests.patch
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0003-Replace-aging-OpenPGP-artifacts-in-the-package-resou.patch
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0004-Replace-aging-OpenPGP-artifacts-in-gnus-mml-sec-test.patch
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