Bump version.gpg.plugin to 3.2.4 (7.1)

[marko-bekhta]

to possibly address the

[INFO] --- gpg:3.1.0:sign (sign-artifacts) @ hibernate-search-bom ---
[INFO] Signing 1 file with default secret key.
gpg: signing failed: No pinentry
gpg: signing failed: No pinentry

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