gnu: python-execnet: Update to 1.9.0-1.d6aa1a5.

* gnu/packages/patches/python-execnet-read-only-fix.patch: Delete file.
* gnu/local.mk (dist_patch_DATA): De-register it.
* gnu/packages/python-xyz.scm (python-execnet): Update to 1.9.0-1.d6aa1a5.
[source]: Remove patch.  Fetch from git.
[build-system]: Use pyproject-build-system.
[arguments]: Remove check phase override.  Add adjust-for-pytest-7.2+,
pretend-version and prepare-for-tests phases.
[native-inputs]: Add python-hatchling, python-hatchling-vcs, python-py and
python-pytest-timeout.

gnu: Add python-hatch-vcs.

* gnu/packages/python-build.scm (python-hatch-vcs): New variable.

gnu: python-hatchling: Update to 1.14.0.

* gnu/packages/python-build.scm (python-hatchling): Update to 1.14.0.
[arguments]: Replace do-not-depend-on-hatchling phase with add-src-to-path.
[description]: Expound.

gnu: python-hatchling: Move to (gnu packages python-build).

* gnu/packages/python-xyz.scm (python-hatchling): Move to...
* gnu/packages/python-build.scm (python-hatchling): ... here.

gnu: python-flit-scm: Update to 1.7.0.

* gnu/packages/python-build.scm (python-flit-scm): Update to 1.7.0.
[build-system]: Use pyproject-build-system.
[arguments]: Remove #:phases.  Add #:build-backend.
[native-inputs]: Delete field.

gnu: python-setuptools-scm: Update to 7.1.0.

* gnu/packages/python-build.scm (python-setuptools-scm): Update to 7.1.0.
[arguments]: Disable tests.
[propagated-inputs]: Add python-typing-extensions.  Remove input labels.

gnu: python-typing-extensions: Move to (gnu packages python-build).

* gnu/packages/python-xyz.scm (python-typing-extensions): Move to...
* gnu/packages/python-build.scm (python-typing-extensions): ... here.

gnu: Remove python-typing-extensions-next.

* gnu/packages/python-xyz.scm (python-typing-extensions-next): Delete variable.

gnu: python-typing-extensions: Use pyproject-build-system.

* gnu/packages/python-xyz.scm (python-typing-extensions)
[arguments]: Remove #:phases argument.
[native-inputs]: Remove python-pypa-build.

gnu: python-flit-core-bootstrap: Update to 3.8.0.

* gnu/packages/python-build.scm (python-flit-core-bootstrap): Update to 3.8.0.
[home-page]: Update URL.

gnu: python-poetry-core: Update to 1.5.2.

* gnu/packages/python-build.scm (python-poetry-core): Update to 1.5.2.
[source]: Adjust URL.
[build-system]: Use pyproject-build-system.
[arguments]: New field.

gnu: python-pep517-bootstrap: Add TODO comment.

* gnu/packages/python-build.scm (python-pep517-bootstrap): Add TODO comment.

gnu: python-wheel: Update to 0.40.0.

* gnu/packages/python-build.scm (python-wheel): Update to 0.40.0.
[home-page]: Update URL.

gnu: python-setuptools: Update to 67.6.1.

* gnu/packages/python-build.scm (python-setuptools): Update to 67.6.1.

gnu: python-pip: Update to 23.1.

* gnu/packages/python-build.scm (python-pip): Update to 23.1.

gnu: python-tomli-w: Use pyproject-build-system.

* gnu/packages/python-build.scm (python-tomli-w) [build-system]: Use
pyproject-build-system.
[arguments]: Remove #:phases arguments.

gnu: python-tomli: Update to 2.0.1.

* gnu/packages/python-build.scm (python-tomli): Update to 2.0.1.
[build-system]: Use pyproject-build-system.
[arguments]: Remove build and install phase overrides.  Add add-self-to-path.
[native-inputs]: Remove python-pypa-build and input labels.

gnu: python-pathspec: Update to 0.11.1.

* gnu/packages/python-build.scm (python-pathspec): Update to 0.11.1.
[home-page]: Update URL.

gnu: Add python-trove-classifiers.

* gnu/packages/python-build.scm (python-trove-classifiers): New variable.

gnu: python-xyz: Move some packages to (gnu packages python-build).

This is to prepare for the new 'python-hatchling' build package, which has
these dependencies.

* gnu/packages/python-xyz.scm (python-pathspec, python-pluggy): Move to...
* gnu/packages/python-build.scm: ... here.  Re-organize definitions a bit,
with comments.