pip-audit: Fails to parse data-requires-python with a `*` char

Bug description

pip-audit raises an InvalidSpecifier error when trying to parse a data-requires-python key containing a * from pypi. Seems related to this old issue : https://github.com/pypa/pip-audit/issues/138

Reproduction steps

I found the nltk package wich contains this link in its pypi page raising the mentioned error:

<a 
  href="https://files.pythonhosted.org/packages/98/06/de681159e6750d0a215c2126e784504e177896afddf5a68cba42ebe42355/nltk-3.6-py3-none-any.whl#sha256=718de6908f538db19a77f96b9e6f5f586b0892d7de5eea32e71f2a2535ed8657" 
  data-requires-python="&gt;=3.5.*" 
>
  nltk-3.6-py3-none-any.whl
</a><br />

To reproduce, we only need to launch a pip-audit with this dependency.

echo "nltk" > requirements.txt
pip-audit -v --requirement requirements.txt                       

Screenshots and logs

DEBUG:pip_audit._cli:parsed arguments: Namespace(cache_dir=None, desc=<VulnerabilityDescriptionChoice.Auto: 'auto'>, dry_run=False, extra_index_urls=[], fix=False, format=<OutputFormatChoice.Columns: 'columns'>, ignore_vulns=[], index_url='https://pypi.org/simple/', local=False, no_deps=False, output=PosixPath('stdout'), paths=[], progress_spinner=<ProgressSpinnerChoice.On: 'on'>, project_path=None, require_hashes=False, requirements=[<_io.TextIOWrapper name='test_require.txt' mode='r' encoding='UTF-8'>], skip_editable=False, strict=False, timeout=15, verbose=True, vulnerability_service=<VulnerabilityServiceChoice.Pypi: 'pypi'>)
DEBUG:cachecontrol.controller:Looking up "https://pypi.org/simple/nltk/" in the cache
DEBUG:cachecontrol.controller:Current age based on date: 1186
DEBUG:cachecontrol.controller:Freshness lifetime from max-age: 600
DEBUG:urllib3.connectionpool:Starting new HTTPS connection (1): pypi.org:443
DEBUG:urllib3.connectionpool:https://pypi.org:443 "GET /simple/nltk/ HTTP/1.1" 304 0
Traceback (most recent call last):
  File "/usr/local/bin/pip-audit", line 8, in <module>
    sys.exit(audit())
  File "/usr/local/lib/python3.8/site-packages/pip_audit/_cli.py", line 448, in audit
    for (spec, vulns) in auditor.audit(source):
  File "/usr/local/lib/python3.8/site-packages/pip_audit/_audit.py", line 67, in audit
    for dep, vulns in self._service.query_all(specs):
  File "/usr/local/lib/python3.8/site-packages/pip_audit/_service/interface.py", line 155, in query_all
    for spec in specs:
  File "/usr/local/lib/python3.8/site-packages/pip_audit/_dependency_source/requirement.py", line 116, in collect
    for _, dep in self._collect_cached_deps(filename, reqs):
  File "/usr/local/lib/python3.8/site-packages/pip_audit/_dependency_source/requirement.py", line 328, in _collect_cached_deps
    for req, resolved_deps in self._resolver.resolve_all(iter(req_values)):
  File "/usr/local/lib/python3.8/site-packages/pip_audit/_dependency_source/interface.py", line 88, in resolve_all
    yield (req, self.resolve(req))
  File "/usr/local/lib/python3.8/site-packages/pip_audit/_dependency_source/resolvelib/resolvelib.py", line 77, in resolve
    result = self.resolver.resolve([req])
  File "/usr/local/lib/python3.8/site-packages/resolvelib/resolvers.py", line 521, in resolve
    state = resolution.resolve(requirements, max_rounds=max_rounds)
  File "/usr/local/lib/python3.8/site-packages/resolvelib/resolvers.py", line 372, in resolve
    self._add_to_criteria(self.state.criteria, r, parent=None)
  File "/usr/local/lib/python3.8/site-packages/resolvelib/resolvers.py", line 168, in _add_to_criteria
    candidates=build_iter_view(matches),
  File "/usr/local/lib/python3.8/site-packages/resolvelib/structs.py", line 169, in build_iter_view
    matches = list(matches)
  File "/usr/local/lib/python3.8/site-packages/pip_audit/_dependency_source/resolvelib/pypi_provider.py", line 362, in find_matches
    [
  File "/usr/local/lib/python3.8/site-packages/pip_audit/_dependency_source/resolvelib/pypi_provider.py", line 362, in <listcomp>
    [
  File "/usr/local/lib/python3.8/site-packages/pip_audit/_dependency_source/resolvelib/pypi_provider.py", line 203, in get_project_from_indexes
    yield from get_project_from_index(index_url, session, project, extras, timeout, state)
  File "/usr/local/lib/python3.8/site-packages/pip_audit/_dependency_source/resolvelib/pypi_provider.py", line 249, in get_project_from_index
    spec = SpecifierSet(py_req)
  File "/usr/local/lib/python3.8/site-packages/packaging/specifiers.py", line 700, in __init__
    parsed.add(Specifier(specifier))
  File "/usr/local/lib/python3.8/site-packages/packaging/specifiers.py", line 234, in __init__
    raise InvalidSpecifier(f"Invalid specifier: '{spec}'")
packaging.specifiers.InvalidSpecifier: Invalid specifier: '>=3.5.*'

Platform information

• Linux
• pip-audit 2.4.9
• Python 3.8.2
• pip 22.3.1