docs: Add use citation from SModelS v2.3 paper

* Add use citation from 'SModelS v2.3: enabling global likelihood
  analyses'.
   - c.f. https://inspirehep.net/literature/2673443

docs/bib/use_citations.bib

@@ -1,3 +1,15 @@
+% 2023-06-30
+@article{MahdiAltakach:2023bdn,
+    author = "Mahdi Altakach, Mohammad and Kraml, Sabine and Lessa, Andre and Narasimha, Sahana and Pascal, Timoth\'ee and Waltenberger, Wolfgang",
+    title = "{SModelS v2.3: enabling global likelihood analyses}",
+    eprint = "2306.17676",
+    archivePrefix = "arXiv",
+    primaryClass = "hep-ph",
+    month = "6",
+    year = "2023",
+    journal = ""
+}
+
 % 2023-06-19
 @article{Stark:2023ont,
     author = "Stark, Giordon and Ots, Camila Aristimuno and Hance, Mike",