fixup! fix(deps): prometheus_client 0.16 compat

ampel/metrics/prometheus.py

@@ -60,16 +60,16 @@ def prometheus_setup_worker(labels: None | dict[str,str] = None) -> None:
     Monkey-patch mmap_key and ValueClass to add implicit labels. This must be
     done before any metrics are instantiated.
     """
-    if labels:
+    if labels is not None:
         from prometheus_client import values
 
-        def mmap_key(metric_name: str, name: str, labelnames: tuple[str], labelvalues: tuple[str], *args) -> str:
+        def mmap_key(metric_name: str, name: str, labelnames: list[str], labelvalues: list[str], help_text: str) -> str:
             return mmap_dict.mmap_key(
                 metric_name,
                 name,
-                tuple(labels.keys()) + labelnames,
-                tuple(labels.values()) + labelvalues,
-                *args,
+                list(labels.keys()) + list(labelnames),
+                list(labels.values()) + list(labelvalues),
+                help_text,
             )
 
         values.mmap_key = mmap_key