release: bump version to 1.2.1

[radoering]

Changed

• Bump poetry-core to 1.2.0.
• Bump poetry-plugin-export to ^1.0.7.

Fixed

• Fix an issue where poetry cache clear did not respect the -n/--no-interaction flag (#6338).
• Fix an issue where poetry lock --no-update updated dependencies from non-PyPI package sources (#6335).
• Fix a poetry install performance regression by falling back to internal pip (#6062).
• Fix an issue where a virtual environment was created unnecessarily when running poetry export (#6282).
• Fix an issue where poetry lock --no-update added duplicate hashes to the lock file (#6389).
• Fix an issue where poetry install fails because of missing hashes for url dependencies (#6389).
• Fix an issue where Poetry was not able to update pip in Windows virtual environments (#6430).
• Fix an issue where Poetry was not able to install releases that contained less common link types (#5767).
• Fix a poetry lock performance regression when checking non-PyPI sources for yanked versions (#6442).
• Fix an issue where --no-cache was not respected when running poetry install (#6479).
• Fix an issue where deprecation warnings for --dev were missing (#6475).
• Fix an issue where Git dependencies failed to clone when insteadOf was used in .gitconfig using the Dulwich Git client (#6506).
• Fix an issue where no cache entry is found when calling poetry cache clear with a non-normalized package name (#6537).
• Fix an invalid virtualenv constraint on Poetry (#6402).
• Fix outdated build system requirements for Poetry (#6509).

Docs

• Add missing path segment to paths used by install.python-poetry.org (#6311).
• Add recommendations about how to install Poetry in a CI environment (#6345).
• Fix examples for --with and --without (#6318).
• Update configuration folder path for macOS (#6395).
• Improve the description of the virtualenv.create option (#6460).
• Clarify that poetry install removes dependencies of non-installed extras (#6229).
• Add a note about pre-commit autoupdate and Poetry's hooks (#6497).

[dimbleby]

surely wants a poetry-core bump eg to pick up python-poetry/poetry-core#466?

[github-actions]

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