Add readline-8.3.tar.gz

Workaround for gnumirror.gnu.org being down for pyenv/pyenv#3347

Author: native-api

pythons/fe5383204467828cd495ee8d1d3c037a7eba1389c22bc6a041f627976f9061cc

@@ -84,6 +84,7 @@ <h3>GNU Readline</h3>
           <ul>
 <li><a href="79a696070a058c233c72dd6ac697021cc64abd5ed51e59db867d66d196a89381">readline-6.2.tar.gz</a></li>
 <li><a href="56ba6071b9462f980c5a72ab0023893b65ba6debb4eeb475d7a563dc65cafd43">readline-6.3.tar.gz</a></li>
+<li><a href="fe5383204467828cd495ee8d1d3c037a7eba1389c22bc6a041f627976f9061cc">readline-8.3.tar.gz</a></li>
           </ul>
 
           <h3>OpenSSL</h3>