Regression: Marker packets should be ignored when verifying detached signatures

E.g. this one:

-----BEGIN PGP SIGNATURE-----
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=TJVu
-----END PGP SIGNATURE-----

sequoia-openpgp 1.1 fails with

Malformed Message: Expected signature, got Marker Packet

See: https://tests.sequoia-pgp.org/#Marker_Packet

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