docs: Add ATLAS s-channel single top cross-section statistical model …

…record (#2324)

* Add ATLAS measurement of the s-channel single top cross-section at 13 TeV
  statistical model HEPDdata record.
   - c.f. https://www.hepdata.net/record/ins2153660
   - Corresponding INSPIRE record: https://inspirehep.net/literature/2153660

docs/bib/HEPData_likelihoods.bib

@@ -18,6 +18,16 @@ @misc{ins2182381
     collaboration = "ATLAS",
 }
 
+% 2022-09-19
+@misc{ins2153660,
+    title = "{Measurement of single top-quark production in the s-channel in proton$-$proton collisions at $\mathrm{\sqrt{s}=13}$ TeV with the ATLAS detector}",
+    doi = "10.17182/hepdata.133620",
+    url = "https://doi.org/10.17182/hepdata.133620",
+    year = "2023",
+    type = "Data Collection",
+    collaboration = "ATLAS",
+}
+
 % 2022-05-05
 @misc{ins2077557,
     title = "{Search for flavour-changing neutral-current couplings between the top quark and the photon with the ATLAS detector at $\sqrt{s} = 13$ TeV}",