Merge branch 'master' into isolated-build

CONTRIBUTING.rst

@@ -52,6 +52,14 @@ is pushed. A new tag can be pushed with::
 
     pipx run --spec="zest.releaser[recommended]>=6.22.1" fullrelease
 
+You can also run the zest.releaser process manually:
+
+1. pick a new version number!
+2. update the latest version and release date in ``docs/source/NEWS.rst``.
+3. update the ``__version__ = "{version}"`` in ``ldaptor/__init__.py``.
+4. tag the new release ``git tag v{version} -m 'Tagging {version}'``
+5. apply steps 2. through 3. for the development release version.
+
 PyPI access is done via the HTTP API token stored in GitHub Secrets as
 PYPI_GITHUB_PACKAGE_UPLOAD from
 https://github.com/twisted/ldaptor/settings/secrets