version number for deprecations

[maelle]

@krlmlr in #800 the version used is 1.5.0 but igraph is already beyond that.

[krlmlr]

Good catch, I missed that.

[maelle]

Do we go with 1.6.0 then? I'll do that in #962

[szhorvat]

Did Kirill confirm that?

[krlmlr]

The next release is 1.6.0 because we're already breaking a lot of stuff.

[github-actions]

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