fix: use InMemoryCatalog to avoid config collision in tests

Author: geruh

tests/integration/test_writes/test_writes.py

@@ -42,6 +42,7 @@
 
 from pyiceberg.catalog import Catalog, load_catalog
 from pyiceberg.catalog.hive import HiveCatalog
+from pyiceberg.catalog.memory import InMemoryCatalog
 from pyiceberg.catalog.sql import SqlCatalog
 from pyiceberg.exceptions import CommitFailedException, NoSuchTableError
 from pyiceberg.expressions import And, EqualTo, GreaterThanOrEqual, In, LessThan, Not
@@ -2330,7 +2331,7 @@ def test_nanosecond_support_on_catalog(
 ) -> None:
     identifier = "default.test_nanosecond_support_on_catalog"
 
-    catalog = load_catalog("default", type="in-memory")
+    catalog = InMemoryCatalog("test-catalog")
     catalog.create_namespace("ns")
 
     _create_table(session_catalog, identifier, {"format-version": "3"}, schema=arrow_table_schema_with_all_timestamp_precisions)