Update release date

Author: amohammed-2

src/content/whats-new/2025/08/whats-new-8-15-high-precision-uniquecount.md renamed to src/content/whats-new/2025/08/whats-new-8-13-high-precision-uniquecount.md

@@ -396,5 +396,5 @@
   "/whats-new/2025/07/whats-new-07-24-db-query-performance-monitoring": "43054",
   "/whats-new/2025/07/whats-new-7-30-compute-budgets": "43055",
   "/whats-new/2025/07/whats-new-7-31-augmenting-user-experiences-browser": "43056",
-  "/whats-new/2025/08/whats-new-8-15-high-precision-uniquecount": "43057"
+  "/whats-new/2025/08/whats-new-8-13-high-precision-uniquecount": "43057"
 }