Add encoding to load_config (#370)

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### Pull Request Checklist:
- [x] This PR addresses an already opened issue (for bug fixes /
features)
    - This PR fixes #xyz
- [x] (If applicable) Documentation has been added / updated (for bug
fixes / features).
- [x] (If applicable) Tests have been added.
- [x] This PR does not seem to break the templates.
- [x] CHANGES.rst has been updated (with summary of main changes).
- [x] Link to issue (:issue:`number`) and pull request (:pull:`number`)
has been added.

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

* Adds an `encoding` parameter to `load_config`.

### Does this PR introduce a breaking change?


### Other information:

* For when Québec should be Québec :)

CHANGES.rst

@@ -19,6 +19,7 @@ Internal changes
     * Updated `ruff` to v0.2.0 and `black` to v24.2.0.
 * Added more tests. (:pull:`366`, :pull:`367`).
 * Refactored ``xs.spatial.subset`` into smaller functions. (:pull:`367`).
+* An `encoding` argument was added to ``xs.config.load_config``. (:pull:`370`).
 
 Bug fixes
 ^^^^^^^^^

xscen/config.py

@@ -130,7 +130,9 @@ def args_as_str(*args: tuple[Any, ...]) -> tuple[str, ...]:
     return tuple(new_args)
 
 
-def load_config(*elements, reset: bool = False, verbose: bool = False):
+def load_config(
+    *elements, reset: bool = False, encoding: str = None, verbose: bool = False
+):
     """Load configuration from given files or key=value pairs.
 
     Once all elements are loaded, special sections are dispatched to their module, but only if
@@ -151,6 +153,8 @@ def load_config(*elements, reset: bool = False, verbose: bool = False):
         "key=value" pairs are set last, after all files are being processed.
     reset: bool
         If True, the current config is erased before loading files.
+    encoding: str, optional
+        The encoding to use when reading files.
     verbose: bool
         if True, each element triggers a INFO log line.
 
@@ -184,7 +188,7 @@ def load_config(*elements, reset: bool = False, verbose: bool = False):
                 configfiles = [file]
 
             for configfile in configfiles:
-                with configfile.open() as f:
+                with configfile.open(encoding=encoding) as f:
                     recursive_update(CONFIG, yaml.safe_load(f))
                     if verbose:
                         logger.info(f"Updated the config with {configfile}.")