check_version() and warn_version() claim that the graph has an *older* format even when in fact it's *newer*

[szhorvat]

check_version() and warn_version() in versions.R issue messages claiming that the graph format is too old whenever its format version does not match the current format version. This message is shown even if the format version is newer, not older.

This will become a problem if we bump the format version and keep the same system.

See also: #829 (comment)

[ntamas]

check_version() does not seem to be called from anywhere so I guess we can remove that. warn_version() is indeed problematic.

[github-actions]

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