Add 1.2.0rc2 announcement

[mkniewallner]

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[github-actions]

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[radoering]

Do we want to mention python-poetry/poetry-core#447? Although it's a core feature, it probably will only be used to write plugins for poetry. Maybe something like:

ProjectPackage.set_version() has been removed in poetry 1.2.0b2 due to hashing issues. That broke plugins setting the project's version dynamically. In order to cover this use case again, hashing issues have been resolved and ProjectPackage.version can be set now with poetry-core#447.

[radoering]

Maybe, we can combine the two plugin specific issues to one topic like "Better support for plugins" or similar?