ci(framework): Migrate to latest pip/setuptools/poetry

[danieljanes]

This PR migrates to Poetry 2.3.2 and updates pyproject.toml to adopt new standardized fields (instead of [tool.poetry]).

[Copilot]

Pull request overview

This PR migrates the Flower framework's Python tooling from Poetry 2.1.3 to Poetry 2.3.2 and updates all pyproject.toml files to adopt the standardized PEP 621 [project] metadata format instead of the Poetry-specific [tool.poetry] table. Poetry is now installed via pipx in CI, and the python -m poetry invocation is replaced with plain poetry throughout all scripts and workflows.

Changes:

• Upgrade pip (25.3 → 26.0.1), setuptools (80.9.0 → 82.0.0), and Poetry (2.1.3 → 2.3.2) across all scripts and CI configs
• Migrate pyproject.toml files from [tool.poetry] to standard [project] tables (PEP 621), retaining [tool.poetry] only for Poetry-specific fields like packages and exclude
• Replace python -m poetry with poetry (and use pipx to install poetry in CI bootstrap)

Reviewed changes

Copilot reviewed 20 out of 20 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
framework/pyproject.toml	Migrated to [project], updated dep format from caret to explicit ranges, updated dev dep versions
framework/e2e/strategies/pyproject.toml	Migrated to [project], keeps path dep in [tool.poetry.dependencies]
dev/pyproject.toml	Migrated to [project], updated dep format
.github/actions/bootstrap/action.yml	Changed to install poetry via pipx, moved pip/setuptools installs outside the poetry-skip guard
.github/workflows/framework-e2e.yml	Replaced python -m poetry with poetry, updated pip version
.github/workflows/framework-test.yml	Replaced python -m poetry with poetry
.github/workflows/framework-release.yml	Replaced python -m poetry publish with poetry publish
.github/workflows/framework-docs.yml	Replaced python -m poetry install with poetry install
.github/workflows/framework-docs-update-translations.yml	Replaced python -m poetry and bare pip with python -m pip
.github/workflows/framework-devtools.yml	Replaced python -m poetry install with poetry install
.github/workflows/intelligence-docs.yml	Replaced python -m poetry install with poetry install
.github/workflows/build-deploy-non-framework-docs.yml	Replaced poetry add ../datasets + poetry install with poetry install + pip install ../datasets
.github/workflows/deprecated-baselines.yml	Replaced python -m poetry install with poetry install
.github/workflows/datasets-test.yml	Replaced python -m poetry install with poetry install
dev/bootstrap.sh	Updated tool versions, replaced python -m poetry with poetry
framework/dev/build.sh	Replaced python -m poetry build with poetry build
framework/dev/publish-nightly.sh	Replaced python -m poetry with poetry
framework/docs/source/conf.py	Updated setuptools and pip version references
framework/docs/source/contributor-tutorial-get-started-as-a-contributor.rst	Updated Poetry version requirement from 1.3 to 2.3
framework/docs/source/contributor-how-to-set-up-a-virtual-env.rst	Updated Poetry venv commands for Poetry 2.x (poetry shell → poetry install + eval "$(poetry env activate)")

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