docs: Add use citation from observable sim gen ML paper (#2356)

* Add use citation from 'Systematic Evaluation of Generative Machine
  Learning Capability to Simulate Distributions of Observables at the
  Large Hadron Collider'.
   - c.f. https://inspirehep.net/literature/2710627

docs/bib/use_citations.bib

@@ -1,3 +1,15 @@
+% 2023-10-13
+@article{Gavranovic:2023oam,
+    author = "Gavranovi\v{c}, Jan and Ker\v{s}evan, Borut Paul",
+    title = "{Systematic Evaluation of Generative Machine Learning Capability to Simulate Distributions of Observables at the Large Hadron Collider}",
+    eprint = "2310.08994",
+    archivePrefix = "arXiv",
+    primaryClass = "hep-ph",
+    month = "10",
+    year = "2023",
+    journal = ""
+}
+
 % 2023-10-11
 @article{MicroBooNE:2023icy,
     author = "{MicroBooNE Collaboration}",