mgr/dashboard: bump up more-itertools

mgr/dashboard: bump up more-itertools

before this change, more-itertools tries to import Sequence from
collections, this leads us to failures like:

```
Traceback (most recent call last):
  File "/usr/lib/python3.10/runpy.py", line 187, in _run_module_as_main
    mod_name, mod_spec, code = _get_module_details(mod_name, _Error)
  File "/usr/lib/python3.10/runpy.py", line 110, in _get_module_details
    __import__(pkg_name)
  File
"/home/jenkins-build/build/workspace/ceph-pull-requests/src/pybind/mgr/dashboard/__init__.py",
line 9, in <module>
    import cherrypy
  File
"/home/jenkins-build/build/workspace/ceph-pull-requests/src/pybind/mgr/dashboard/.tox/openapi-check/lib/python3.10/site-packages/cherrypy/__init__.py",
line 76, in <module>
    from . import _cprequest, _cpserver, _cptree, _cplogging, _cpconfig
  File
"/home/jenkins-build/build/workspace/ceph-pull-requests/src/pybind/mgr/dashboard/.tox/openapi-check/lib/python3.10/site-packages/cherrypy/_cprequest.py",
line 11, in <module>
    from cherrypy import _cpreqbody
  File
"/home/jenkins-build/build/workspace/ceph-pull-requests/src/pybind/mgr/dashboard/.tox/openapi-check/lib/python3.10/site-packages/cherrypy/_cpreqbody.py",
line 135, in <module>
    import cheroot.server
  File
"/home/jenkins-build/build/workspace/ceph-pull-requests/src/pybind/mgr/dashboard/.tox/openapi-check/lib/python3.10/site-packages/cheroot/server.py",
line 96, in <module>
    from .workers import threadpool
  File
"/home/jenkins-build/build/workspace/ceph-pull-requests/src/pybind/mgr/dashboard/.tox/openapi-check/lib/python3.10/site-packages/cheroot/workers/threadpool.py",
line 20, in <module>
    from jaraco.functools import pass_none
  File
"/home/jenkins-build/build/workspace/ceph-pull-requests/src/pybind/mgr/dashboard/.tox/openapi-check/lib/python3.10/site-packages/jaraco/functools.py",
line 8, in <module>
    import more_itertools
  File
"/home/jenkins-build/build/workspace/ceph-pull-requests/src/pybind/mgr/dashboard/.tox/openapi-check/lib/python3.10/site-packages/more_itertools/__init__.py",
line 1, in <module>
    from more_itertools.more import *  # noqa
  File
"/home/jenkins-build/build/workspace/ceph-pull-requests/src/pybind/mgr/dashboard/.tox/openapi-check/lib/python3.10/site-packages/more_itertools/more.py",
line 3, in <module>
    from collections import Counter, defaultdict, deque, Sequence
ImportError: cannot import name 'Sequence' from 'collections'
(/usr/lib/python3.10/collections/__init__.py)
ERROR: InvocationError for command
/home/jenkins-build/build/workspace/ceph-pull-requests/src/pybind/mgr/dashboard/.tox/openapi-check/bin/python3
-m dashboard.controllers.docs
/home/jenkins-build/build/workspace/ceph-pull-requests/src/pybind/mgr/dashboard/.tox/openapi-check/tmp/openapi.yaml
(exited with code 1)
```
after this change, more-itertools is pin'ed at the latest stable
at the time of writing, which includes the fixes including
https://github.com/more-itertools/more-itertools/commit/30a861bc5a4f53a9ba73923c9048a3632a0f9d18
.

please note, more-itertools dropped python3.3 support. but neither
do us support this python version, so we should be safe.

Signed-off-by: Kefu Chai <tchaikov@gmail.com>