Python: options file was not enough, split into 2/3

I reckon this is due to the Python 3 version used by the Python 2 tests
is different from 3.12, so even with --lang=3 the tests are still using
an incompatible version :(

python/ql/test/3/query-tests/Summary/also_python_code

@@ -0,0 +1,7 @@
+#!/usr/bin/env python
+
+# although this is actually Python code, it is not included by the extractor by default.
+
+print("this is also code")
+
+print("but just dummy code")