$ cat measure.py
import gc
import sys

for _ in range(5):
    gc.collect()
    before = sys.gettotalrefcount()

    import sqlite3
    del sys.modules['sqlite3']
    del sqlite3

    gc.collect()
    after = sys.gettotalrefcount()

    print(f"{before=}, {after=}")

$ ./python.exe measure.py
before=51469, after=66883
before=66892, after=66892
before=66892, after=66892
before=66892, after=66892
before=66892, after=66892