Ignore or fix most of the remaining ruff 0.9.6 errors (ipython#1331)

Author: Carreau

ipykernel/datapub.py

@@ -29,7 +29,7 @@
 class ZMQDataPublisher(Configurable):
     """A zmq data publisher."""
 
-    topic = topic = CBytes(b"datapub")
+    topic = CBytes(b"datapub")
     session = Instance(Session, allow_none=True)
     pub_socket = Any(allow_none=True)
     parent_header = Dict({})

pyproject.toml

@@ -277,6 +277,9 @@ ignore = [
   "PTH123",
   # use `X | Y` for type annotations, this does not works for dynamic getting type hints on older python
   "UP007",
+  "UP031", # Use format specifiers instead of percent format
+  "PT023", # Use `@pytest.mark.skip` over `@pytest.mark.skip()`
+  "PT001", # autofixable: Use `@pytest.fixture` over `@pytest.fixture()`
 ]
 unfixable = [
   # Don't touch print statements