docs: Add use citation from revisiting mono-tau tails at the LHC paper (

#1744)

* Add use citation from Revisiting mono-τ tails at the LHC by Florentin Jaffredo.
   - c.f. https://inspirehep.net/literature/1998227

docs/bib/use_citations.bib

@@ -1,3 +1,15 @@
+% 2021-12-29
+@article{Jaffredo:2021ymt,
+    author = "Jaffredo, Florentin",
+    title = "{Revisiting mono-$\tau$ tails at the LHC}",
+    eprint = "2112.14604",
+    archivePrefix = "arXiv",
+    primaryClass = "hep-ph",
+    month = "12",
+    year = "2021",
+    journal = ""
+}
+
 % 2021-09-30
 @booklet{ATL-PHYS-PUB-2021-038,
       author        = "{ATLAS Collaboration}",