add RETURN_CONST as an allowed _const_code in safeeval #2352
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On my m1 mac, with python 3.12.1, evaluating safeeval.const('1') requires 'RETURN_CONST' as an allowed opcode. I added this opcode to allowed opcodes, and also changed some error mesage generation in ssh.process() (which is where the problem occured for me). I removed the python.recvall() call in the error message generation, since this caused everything to hang for me in a very confusing way, but I can re-add it if you want me to.