hopefully fix citation date fmt

Baxter Eaves · Baxter Eaves · commit 8dd929c3244e · 2025-02-28T09:01:14.000-06:00
diff --git a/CITATION.cff b/CITATION.cff
@@ -30,4 +30,4 @@ keywords:
   - Mathematics
 license: MIT
 version: 0.18.1
-date-released: 2025-02-28
+date-released: '2025-02-28'
