Add changes file for GETINFO current-time/{local,utc}

changes/ticket25511

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+  o Minor features (control port):
+    - Introduce GETINFO "current-time/{local,utc}" to return the local
+      and UTC times respectively in ISO format. This helps a controller
+      like Tor Browser detect a time-related error. Closes ticket 25511.
+      Patch by Neel Chauhan.