build: Remove pytest pin in requirements-devenv.txt

[szokeasaurusrex]

The pytest pin in requirements-devenv.txt appears to be unnecessary. Our tests anyways do not seem to respect this pin; the actual pins are defined for each environment in tox.ini.

ref #3035

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
13593	1	13592	4114

View the top 1 failed tests by shortest run time

tests.integrations.httpx.test_httpx test_omit_url_data_if_parsing_fails

Stack Traces | 5.12s run time

.tox/py3.11-httpx-v0.27/lib/python3.11.../httpx/_transports/default.py:72: in map_httpcore_exceptions
    yield
.tox/py3.11-httpx-v0.27/lib/python3.11.../httpx/_transports/default.py:236: in handle_request
    resp = self._pool.handle_request(req)
.tox/py3.11-httpx-v0.27/lib/python3.11.../httpcore/_sync/connection_pool.py:216: in handle_request
    raise exc from None
.tox/py3.11-httpx-v0.27/lib/python3.11.../httpcore/_sync/connection_pool.py:196: in handle_request
    response = connection.handle_request(
.tox/py3.11-httpx-v0.27/lib/python3.11.../httpcore/_sync/connection.py:99: in handle_request
    raise exc
.tox/py3.11-httpx-v0.27/lib/python3.11.../httpcore/_sync/connection.py:76: in handle_request
    stream = self._connect(request)
.tox/py3.11-httpx-v0.27/lib/python3.11.../httpcore/_sync/connection.py:122: in _connect
    stream = self._network_backend.connect_tcp(**kwargs)
.tox/py3.11-httpx-v0.27/lib/python3.11.../httpcore/_backends/sync.py:205: in connect_tcp
    with map_exceptions(exc_map):
.../hostedtoolcache/Python/3.11.10....../x64/lib/python3.11/contextlib.py:158: in __exit__
    self.gen.throw(typ, value, traceback)
.tox/py3.11-httpx-v0.27/lib/python3.11.../site-packages/httpcore/_exceptions.py:14: in map_exceptions
    raise to_exc(exc) from exc
E   httpcore.ConnectError: [Errno 101] Network is unreachable

The above exception was the direct cause of the following exception:
.../integrations/httpx/test_httpx.py:305: in test_omit_url_data_if_parsing_fails
    response = httpx_client.get(url)
.tox/py3.11-httpx-v0.27/lib/python3.11................../site-packages/httpx/_client.py:1066: in get
    return self.request(
.tox/py3.11-httpx-v0.27/lib/python3.11................../site-packages/httpx/_client.py:837: in request
    return self.send(request, auth=auth, follow_redirects=follow_redirects)
sentry_sdk/utils.py:1788: in runner
    return sentry_patched_function(*args, **kwargs)
sentry_sdk/integrations/httpx.py:87: in send
    rv = real_send(self, request, **kwargs)
.tox/py3.11-httpx-v0.27/lib/python3.11................../site-packages/httpx/_client.py:926: in send
    response = self._send_handling_auth(
.tox/py3.11-httpx-v0.27/lib/python3.11................../site-packages/httpx/_client.py:954: in _send_handling_auth
    response = self._send_handling_redirects(
.tox/py3.11-httpx-v0.27/lib/python3.11................../site-packages/httpx/_client.py:991: in _send_handling_redirects
    response = self._send_single_request(request)
.tox/py3.11-httpx-v0.27/lib/python3.11................../site-packages/httpx/_client.py:1027: in _send_single_request
    response = transport.handle_request(request)
.tox/py3.11-httpx-v0.27/lib/python3.11.../httpx/_transports/default.py:235: in handle_request
    with map_httpcore_exceptions():
.../hostedtoolcache/Python/3.11.10....../x64/lib/python3.11/contextlib.py:158: in __exit__
    self.gen.throw(typ, value, traceback)
.tox/py3.11-httpx-v0.27/lib/python3.11.../httpx/_transports/default.py:89: in map_httpcore_exceptions
    raise mapped_exc(message) from exc
E   httpx.ConnectError: [Errno 101] Network is unreachable

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