Copier udpate and dependency lock.

[YooSunYoung]

This change should fix the lower-bound nightly test: https://github.com/scipp/scitiff/actions/runs/21464963439/job/61824944315

The lower bound of requests >= 2.23.5 somehow triggered this warning:

importlib ImportWarning: _SixMetaPathImporter.find_spec() not found; falling back to find_module()

I don't understand why bumping the version of requests fixed the issue, but I will not investigate further...

• I copier-updated it as well. So most of changes except for the pyproject.toml is not related to this warning.

Full Error Log

:1072: in _find_spec ??? E AttributeError: '_SixMetaPathImporter' object has no attribute 'find_spec'

During handling of the above exception, another exception occurred:
tests/validate_test.py:4: in
import scipp as sc
.venv/lib/python3.11/site-packages/scipp/init.py:18: in
from .core import version
.venv/lib/python3.11/site-packages/scipp/core/init.py:47: in
from .operations import as_const
.venv/lib/python3.11/site-packages/scipp/core/operations.py:9: in
from ..typing import ScippIndex, VariableLikeType
.venv/lib/python3.11/site-packages/scipp/typing.py:9: in
import numpy.typing as npt
.venv/lib/python3.11/site-packages/numpy/init.py:109: in
from . import _distributor_init
.venv/lib/python3.11/site-packages/numpy/_distributor_init.py:13: in
from . import _distributor_init_local # noqa: F401
:1176: in _find_and_load
???
:1138: in _find_and_load_unlocked
???
:1074: in _find_spec
???
:1047: in _find_spec_legacy
???
E ImportWarning: _SixMetaPathImporter.find_spec() not found; falling back to find_module()