Fix reference misnumbering

The intention was to swap out the 1999 code of ethics for the 2018 version (the following reference), not to keep both
Gobbees · Jun 15, 2023 · ef449e4 · ef449e4
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diff --git a/chapter-12-refs.md b/chapter-12-refs.md
@@ -299,9 +299,6 @@ Chapter 12 References
     at *Network and Distributed System Security Symposium* (NDSS), February 2014.
     [doi:10.14722/ndss.2014.23379](http://dx.doi.org/10.14722/ndss.2014.23379)
 
-1.  “[Software Engineering Code of Ethics and Professional Practice](http://www.acm.org/about/se-code),”
-    Association for Computing Machinery, *acm.org*, 1999.
-
 1.  “[ACM Code of Ethics and Professional Conduct](https://www.acm.org/code-of-ethics),”
     Association for Computing Machinery, *acm.org*, 2018.