Revert "undeprecate available() (#9027)" #9165
                
     Merged
            
            
          
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This reverts commit 5d97e02.
As a result of discussion on PR #9028 "WiFiServer - implementation aligned with Arduino.cc" this is a PR to mark
server.availableas deprecated.I also recommend the PR #8930 "WiFiServer - don't inherit from Print and Server"