Update the 8.1.0 rc2 release link in the website (#225)

Signed-off-by: Ran Shidlansik <[email protected]>

Author: ranshid

content/download/releases/v8-1-0.md

@@ -1,8 +1,8 @@
 ---
-title: "8.1.0-rc1"
-date: 2025-02-16
+title: "8.1.0-rc2"
+date: 2025-03-20
 extra:
-    tag: "8.1.0-rc1"
+    tag: "8.1.0-rc2"
     artifact_source: https://download.valkey.io/releases/
     artifact_fname: "valkey"
     container_registry:
@@ -31,4 +31,4 @@ extra:
                 -   x86_64
 ---
 
-Valkey 8.1.0-rc1 Release
+Valkey 8.1.0-rc2 Release