Release 3.1.0

The repository has been moved to github.com/gocsaf/csaf and thus uses a new go module path.
Uses a custom HTTP user-agent header by default.
Avoids a race condition when downloading in parallel (#546).
Turns missing an OpenPGP fingerprint into a warning (#555).
Checking several domains in one command line call works better (#523).
Utilizes currently maintained go version 1.22 (#573).
Switched licenses of original content from MIT to Apache2.0.
13 Issues were closed.
28 PRs were merged.

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