🚨 accommodate new ruff warnings

docs/source/conf.py

@@ -109,7 +109,7 @@
 class CDAStyle(UnsrtStyle):
     """Custom style for including PDF links."""
 
-    def format_url(self, _e: Entry) -> HRef:
+    def format_url(self, _e: Entry) -> HRef:  # noqa: PLR6301
         """Format URL field as a link to the PDF."""
         url = field("url", raw=True)
         return href()[url, "[PDF]"]

src/mqt/qmap/qiskit/backend.py

@@ -94,7 +94,7 @@ def import_target(target: Target) -> Architecture.Properties:
         props.set_frequency(i, qubit_props.frequency)
 
     for instruction, qargs in target.instructions:
-        if instruction.name in ("reset", "delay"):
+        if instruction.name in {"reset", "delay"}:
             continue
 
         instruction_props = target[instruction.name][qargs]

src/mqt/qmap/subarchitectures.py

@@ -128,7 +128,7 @@ def from_library(cls, lib_name: str | Path) -> SubarchitectureOrder:
         """
         path = Path(lib_name).with_suffix(".pickle")
         with path.open("rb") as f:
-            temp = pickle.load(f)
+            temp = pickle.load(f)  # noqa: S301
 
         so = SubarchitectureOrder()
         so.__dict__.update(temp.__dict__)
@@ -329,7 +329,8 @@ def __transitive_closure(self, po: PartialOrder) -> PartialOrder:
 
         return po_trans
 
-    def __reflexive_closure(self, po: PartialOrder) -> PartialOrder:
+    @classmethod
+    def __reflexive_closure(cls, po: PartialOrder) -> PartialOrder:
         """Compute reflexive closure of partial order."""
         po_ref = PartialOrder({})
         for k, v in po.items():