fix: add importorskip for psycopg2 in acmg library tests

Author: bencap

tests/lib/test_acmg.py

@@ -1,6 +1,10 @@
+# ruff: noqa: E402
+
 import pytest
 from sqlalchemy import select
 
+pytest.importorskip("psycopg2")
+
 from mavedb.lib.acmg import (
     ACMGCriterion,
     StrengthOfEvidenceProvided,