docs: Add use citations from CHEP 2023 proceedings preprints (#2345)

* Add general citation from 'Software Citation in HEP: Current State and
  Recommendations for the Future'.
   - c.f. https://inspirehep.net/literature/2703030
* Add use citation from 'Bayesian Methodologies with pyhf'.
   - c.f. https://inspirehep.net/literature/2704887

Author: matthewfeickert

docs/bib/general_citations.bib

@@ -1,3 +1,15 @@
+% 2023-09-25
+@inproceedings{Feickert:2023ajm,
+    author = "Feickert, Matthew and Katz, Daniel S. and Neubauer, Mark S. and Sexton-Kennedy, Elizabeth and Stewart, Graeme A.",
+    title = "{Software Citation in HEP: Current State and Recommendations for the Future}",
+    booktitle = "{26th International Conference on Computing in High Energy \& Nuclear Physics}",
+    eprint = "2309.14571",
+    archivePrefix = "arXiv",
+    primaryClass = "hep-ex",
+    month = "9",
+    year = "2023"
+}
+
 % 2023-08-31
 @article{Kagan:2023gxz,
     author = "Kagan, Michael and Heinrich, Lukas",

docs/bib/use_citations.bib

@@ -1,3 +1,15 @@
+% 2023-09-29
+@inproceedings{Feickert:2023hhr,
+    author = "Feickert, Matthew and Heinrich, Lukas and Horstmann, Malin",
+    title = "{Bayesian Methodologies with pyhf}",
+    booktitle = "{26th International Conference on Computing in High Energy \& Nuclear Physics}",
+    eprint = "2309.17005",
+    archivePrefix = "arXiv",
+    primaryClass = "stat.CO",
+    month = "9",
+    year = "2023"
+}
+
 % 2023-09-20
 @article{Belfkir:2023vpo,
     author = "Belfkir, Mohamed and Jueid, Adil and Nasri, Salah",