gh-109653: Remove unused imports in the Lib/ directory (#109803)

Lib/test/test_sqlite3/test_dump.py

@@ -1,7 +1,6 @@
 # Author: Paul Kippes <kippesp@gmail.com>
 
 import unittest
-import sqlite3 as sqlite
 
 from .util import memory_database
 from .util import MemoryDatabaseMixin

Lib/test/test_sqlite3/test_userfunctions.py

@@ -29,7 +29,7 @@ from unittest.mock import Mock, patch
 from test.support import bigmemtest, gc_collect
 
 from .util import cx_limit, memory_database
-from .util import with_tracebacks, check_tracebacks
+from .util import with_tracebacks
 
 
 def func_returntext():

Lib/test/test_sqlite3/util.py

@@ -4,7 +4,6 @@ import io
 import re
 import sqlite3
 import test.support
-import unittest
 
 
 # Helper for temporary memory databases