Add Python 3.14

[shenxianpeng]

• Add Python 3.14 to ci.yml, pyproject.toml and tox.ini and .gitpod.yml
• Add virtual environment folders to .gitignore

[shenxianpeng]

The following test case failed because docutils was upgraded.
If I pin docutils to 0.21.2, test will pass (lint may also pass without any changes)

tests/test_cli.py:52: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
readme_renderer/__main__.py:50: in main
    rendered = render_rst(source, stream=sys.stderr)
readme_renderer/rst.py:123: in render
    parts = publish_parts(raw, writer=writer, settings_overrides=settings)
.tox/py/lib/python3.9/site-packages/docutils/core.py:548: in publish_parts
    _output, publisher = publish_programmatically(
.tox/py/lib/python3.9/site-packages/docutils/core.py:794: in publish_programmatically
    output = publisher.publish(enable_exit_status=enable_exit_status)
.tox/py/lib/python3.9/site-packages/docutils/core.py:272: in publish
    output = self.writer.write(self.document, self.destination)
.tox/py/lib/python3.9/site-packages/docutils/writers/__init__.py:97: in write
    self.translate()
.tox/py/lib/python3.9/site-packages/docutils/writers/_html_base.py:161: in translate
    self.visitor = visitor = self.translator_class(self.document)
.tox/py/lib/python3.9/site-packages/docutils/writers/html5_polyglot/__init__.py:130: in __init__
    super().__init__(document)
.tox/py/lib/python3.9/site-packages/docutils/writers/_html_base.py:336: in __init__
    self.stylesheet = [self.stylesheet_call(path)
.tox/py/lib/python3.9/site-packages/docutils/writers/_html_base.py:336: in <listcomp>
    self.stylesheet = [self.stylesheet_call(path)
.tox/py/lib/python3.9/site-packages/docutils/writers/_html_base.py:529: in stylesheet_call
    content = Path(path).read_text(encoding='utf-8')
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = PosixPath('/home/runner/work/readme_renderer/readme_renderer/.tox/py/lib/python3.9/site-packages/docutils/writers/html5_polyglot/minimal.css')
encoding = 'utf-8', errors = None

    def read_text(self, encoding=None, errors=None):
        """
        Open the file in text mode, read it, and close the file.
        """
>       with self.open(mode='r', encoding=encoding, errors=errors) as f:
E       ValueError: I/O operation on closed file.

/opt/hostedtoolcache/Python/3.9.23/x64/lib/python3.9/pathlib.py:1194: ValueError
================================ tests coverage ================================
_______________ coverage: platform linux, python 3.9.23-final-0 ________________

[miketheman]

See existing #332 and #328 - these two combined will solve the issue, so I will. try to get around to merging those soon, and then this PR should be revisited.

[shenxianpeng]

Maybe these dependencies should be pinned to specific versions, and then add Dependabot update them per PR.

readme_renderer/pyproject.toml

Lines 10 to 14 in 04d5cfe

	dependencies = [
	"nh3>=0.2.14",
	"docutils>=0.21.2",
	"Pygments>=2.5.1",
	]

This would help make it easier to identify what caused any issues.

[shenxianpeng]

See existing #332 and #328 - these two combined will solve the issue, so I will. try to get around to merging those soon, and then this PR should be revisited.

So I’ll remove the unrelated changes and keep only the Python 3.14 updates in this PR.