chore: Update Hedgedoc 2 release year

Signed-off-by: Sheogorath <[email protected]>

Author: SISheogorath

content/english/history/_index.html

@@ -92,7 +92,7 @@ <h3><time>December '20</time></h3>
 {{< /history-entry >}}
 
 {{< history-entry graph="void-left point-left red">}}
-    <h3><time>2024</time></h3>
+    <h3><time>2025</time></h3>
     Tentative release date of HedgeDoc 2
 {{< /history-entry >}}