Update ruff target to py39 (#460)

Author: ulgens

django_prometheus/db/common.py

@@ -63,16 +63,18 @@ class CursorWrapper(cursor_class):
 
         def execute(self, *args, **kwargs):
             execute_total.labels(alias, vendor).inc()
-            with query_duration_seconds.labels(**labels).time(), ExceptionCounterByType(
-                errors_total, extra_labels=labels
+            with (
+                query_duration_seconds.labels(**labels).time(),
+                ExceptionCounterByType(errors_total, extra_labels=labels),
             ):
                 return super().execute(*args, **kwargs)
 
         def executemany(self, query, param_list, *args, **kwargs):
             execute_total.labels(alias, vendor).inc(len(param_list))
             execute_many_total.labels(alias, vendor).inc(len(param_list))
-            with query_duration_seconds.labels(**labels).time(), ExceptionCounterByType(
-                errors_total, extra_labels=labels
+            with (
+                query_duration_seconds.labels(**labels).time(),
+                ExceptionCounterByType(errors_total, extra_labels=labels),
             ):
                 return super().executemany(query, param_list, *args, **kwargs)
 

pyproject.toml

@@ -7,8 +7,7 @@ addopts = " --ignore django_prometheus/tests/end2end"
 
 [tool.ruff]
 line-length = 120
-target-version = "py38"
+target-version = "py39"
 
 [tool.ruff.lint]
 select = ["B", "C4", "E", "F", "I", "T10", "YTT", "W"]
-