Add paper_url for LibriSeVoc + SONAR (Datasets-tab paper links)

LibriSeVoc -> arXiv:2304.13085; SONAR -> arXiv:2410.04324. Manifest is the source of truth for the Datasets-tab paper link (app._dataset_paper_url); these two weren't in the _DATASET_PAPERS fallback.

manifest.yaml

@@ -44,8 +44,10 @@ core_set:
   - id: SpeechAntiSpoofingBenchmarks/LibriSeVoc
     revision: 13d69268a57afc7ebba2421d2a31730a390f1ff2
     n_trials: 18487
+    paper_url: https://arxiv.org/abs/2304.13085
   - id: SpeechAntiSpoofingBenchmarks/SONAR
     revision: bf65a137339acbe91f4baa702b7638fcda69aca3
     n_trials: 4548
+    paper_url: https://arxiv.org/abs/2410.04324
 
 extended: []