chore: fix store tests on Windows (#2769)

It's just a matter of explicitly closing the database, so that TempDir.removeAll doesn't fail.

test/store/memo_relation_test.go

@@ -55,4 +55,5 @@ func TestMemoRelationStore(t *testing.T) {
 	}
 	_, err = ts.UpsertMemoRelation(ctx, commentRelation)
 	require.NoError(t, err)
+	ts.Close()
 }