Update dependency python-neutronclient to v14

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
python-neutronclient	==13.0.0 → ==14.0.0

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
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The artifact failure details are included below:

File name: Pipfile.lock

Command failed: pipenv lock
Locking  dependencies...
ERROR: No matching distribution found for openstacksdk==4.17.0

The conflict is caused by:
    The user requested openstacksdk==4.17.0
Traceback (most recent call last):
  File 
"/opt/containerbase/tools/pipenv/2026.8.0/3.10.21/lib/python3.10/site-packages/p
ipenv/routines/lock.py", line 408, in do_lock
    venv_resolve_deps(
  File 
"/opt/containerbase/tools/pipenv/2026.8.0/3.10.21/lib/python3.10/site-packages/p
ipenv/utils/resolver.py", line 2061, in venv_resolve_deps
    results = _run_resolver_subprocess(
  File 
"/opt/containerbase/tools/pipenv/2026.8.0/3.10.21/lib/python3.10/site-packages/p
ipenv/utils/resolver.py", line 1679, in _run_resolver_subprocess
    locked = _dispatch_resolver_response(response, st)
  File 
"/opt/containerbase/tools/pipenv/2026.8.0/3.10.21/lib/python3.10/site-packages/p
ipenv/utils/resolver.py", line 1793, in _dispatch_resolver_response
    raise exc
pipenv.exceptions.ResolutionFailure: ERROR: ERROR: No matching distribution 
found for openstacksdk==4.17.0

The conflict is caused by:
    The user requested openstacksdk==4.17.0