release: bump version to 1.2.2

[radoering]

Added

• Add forward compatibility for lock file format 2.0, which will be used by Poetry 1.3 (#6608).

Changed

• Allow poetry lock to re-generate the lock file when invalid or incompatible (#6753).

Fixed

• Fix an issue where the deprecated JSON API was used to query PyPI for available versions of a package (#6081).
• Fix an issue where versions were escaped wrongly when building the wheel name (#6476).
• Fix an issue where the installation of dependencies failed if pip is a dependency and is updated in parallel to other dependencies (#6582).
• Fix an issue where the names of extras were not normalized according to PEP 685 (#6541).
• Fix an issue where sdist names were not normalized (#6621).
• Fix an issue where invalid constraints, which are ignored, were only reported in a debug message instead of a warning (#6730).
• Fix an issue where poetry shell was broken in git bash on Windows (#6560).

Docs

• Rework the README and contribution docs (#6552).
• Fix for inconsistent docs for multiple-constraint dependencies (#6604).
• Rephrase plugin configuration (#6557).
• Add a note about publishable repositories to publish (#6641).
• Fix the path for lazy-loaded bash completion (#6656).
• Fix a reference to the invalid option --require (#6672).
• Add a PowerShell one-liner to the basic usage section (#6683).
• Fix the minimum poetry version in the example for plugins (#6739).

poetry-core (1.3.2)

• Add 3.11 to the list of available Python versions (#477).
• Fix an issue where caret constraints of pre-releases with a major version of 0 resulted in an empty version range (#475).

poetry-plugin-export (^1.1.2)

• Add support for exporting constraints.txt files (#128).
• Fix an issue where a relative path passed via -o was not interpreted relative to the current working directory (#130).

[neersighted]

Blocking this on a change in the export plugin -- we discussed the fact that the author of the constraints.txt PR actually won't be able to use the feature as they use editable deps and those currently trigger a RuntimeError. We've decided it would be preferable to write a warning to stderr and continue (both for this user and in the general case) -- this has to happen before the release to avoid it being a breaking change.

[neersighted]

Per the call today, we also established at at least while we're including poetry-plugin-export as a built-in component, we should roll up the effective changes between the version bumps.

We should also roll up user-facing changes for core based on where the pin moves.

I think these should each be their own sub-section -- once this PR is updated with that changelog information we can roll it up into the release announcement as well: python-poetry/website#93

[radoering]

I only added changelog entries for poetry-core and poetry-export-plugin PRs that don't have a poetry companion PR with a similar changelog entry.

[neersighted]

Re-worked the format a little, PTAL.

Website PR is prepped and just needs the final changelog: python-poetry/website#93

[github-actions]

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