[Bug 300121] textproc/py-Tempita: Update to 0.6.0 (0.5.2 imports cgi, removed in Python 3.13)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=300121

            Bug ID: 300121
           Summary: textproc/py-Tempita: Update to 0.6.0 (0.5.2 imports
                    cgi, removed in Python 3.13)
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: python@FreeBSD.org
          Reporter: patrick@crandol.com
             Flags: maintainer-feedback?(python@FreeBSD.org)
          Assignee: python@FreeBSD.org

Tempita 0.5.2 does `import cgi` at the top of tempita/__init__.py and
uses cgi.escape() for HTML quoting. The cgi module was removed in
Python 3.13, so with 3.13 tempita, and every module that imports it,
fails. For example, from devel/py-sqlalchemy-migrate:

    $ python3.13 -c 'import migrate.versioning.api'
    ModuleNotFoundError: No module named 'cgi'

(raised from tempita/__init__.py, line 34). cgi.escape itself was
already removed in Python 3.8, so html_quote (tempita/__init__.py lines
446 and 449) is broken at runtime on 3.12 as well.

0.6.0 is a Python 3 release by the new upstream (TurboGears). It
replaces cgi.escape() with html.escape(), so the cgi module is no longer
needed, and the local 2to3-style patches (files/patch-setup.py,
files/patch-tempita-__init__.py) can go. The patch:

- updates to 0.6.0 (the distfile is now tempita-0.6.0.tar.gz, hence
  DISTNAME)
- updates WWW to https://github.com/TurboGears/tempita
- ships LICENSE (LICENSE_FILE)
- removes the two local patches

The only change in behaviour is that html_quote also escapes ' as
'.

Misc changes:
- the port switches to USE_PYTHON=pep517 (the package metadata becomes
  dist-info)
- concurrent is added to USE_PYTHON
- portlint warnings are fixed

Impact: databases/py-sqlalchemy-migrate and www/py-WebError depend on
it. I checked databases/py-sqlalchemy-migrate with this change, with
Python 3.12 and 3.13, from fresh installs: migrate.versioning.api
creates a repository and a script and puts a database under version
control, which renders its Tempita templates, and db_version returns 0.
The check ran with setuptools installed by hand: sqlalchemy-migrate
needs it at run time, but its port does not declare it, which is not
caused by this change. www/py-WebError was not checked: it is proposed
for deprecation and marked BROKEN in its own PR (it imports cgi).

Tested: poudriere bulk on amd64, both with Python 3.12 and with
DEFAULT_VERSIONS+=python=3.13, after the pep517 switch: builds, installs
the package metadata as .dist-info, and the modules import from the
built package (only optional extras are missing).

Changes: https://github.com/TurboGears/tempita/commits/main

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