fix(examples): fix examples uri for sqlite

superset/config.py

@@ -1632,7 +1632,9 @@ def EMAIL_HEADER_MUTATOR(  # pylint: disable=invalid-name,unused-argument
 
 # URI to database storing the example data, points to
 # SQLALCHEMY_DATABASE_URI by default if set to `None`
-SQLALCHEMY_EXAMPLES_URI = "sqlite:///" + os.path.join(DATA_DIR, "examples.db")
+SQLALCHEMY_EXAMPLES_URI = (
+    f"""sqlite:///{os.path.join(DATA_DIR, "examples.db")}?check_same_thread=false"""
+)
 
 # Optional prefix to be added to all static asset paths when rendering the UI.
 # This is useful for hosting assets in an external CDN, for example