Fixed #35395 -- slice filter crashes on an empty dict with Python 3.12.

Keep consistent behaviour of slice() filter between python 3.12 and prior
versions in the case of a dict passed to the filter (catch the new to python
3.12 KeyError exception).

django/template/defaultfilters.py

@@ -644,7 +644,7 @@ def slice_filter(value, arg):
                 bits.append(int(x))
         return value[slice(*bits)]
 
-    except (ValueError, TypeError):
+    except (ValueError, TypeError, KeyError):
         return value  # Fail silently.