Ouranosinc / xclim / 20178345231

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Adopt Pytest v9.0+, RuntimeWarning changes (#2276)

### What kind of change does this PR introduce?

* Modifies a few of the squelched `RuntimeWarning` messages in order to
provide more information for users of `indices`, while silencing these
messages for `indicator` users and the CLI.
* Updates `pytest` to the latest conventions (version `9.0+`), enabling
the new `strict` mode.

### Does this PR introduce a breaking change?

For some developers, yes. There will likely be more noise emitted from
workflows relying on `xclim.indices`. These can be set to be ignored
using context managers:
```python
with numpy.errstate(divide='ignore'):
    ...
```
or:
```python
with warnings.catch_warnings():
    warnings.simplefilter("ignore")
    ...
```

### Other information:

The new `pytest` now offers a `strict` mode. This means that
configurations for `markers` and `xfail` must be explicitly defined,
`parametrizations` must always be uniquely-defined, and the
configuration found in `pyproject.toml` must not contain any errors. For
more information:
https://docs.pytest.org/en/stable/reference/reference.html#confval-strict

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