fix: correct link (#4992)

Signed-off-by: Mike Fiedler <miketheman@gmail.com>

Author: miketheman

peps/pep-0301.rst

@@ -354,7 +354,7 @@ References
    (http://www.catb.org/~esr/trove/)
 
 .. [3] Vaults of Parnassus
-   (http://www.vex.net/parnassus/)
+   (https://web.archive.org/web/20030603185537/http://www.vex.net/parnassus/)
 
 .. [4] CPAN
    (http://www.cpan.org/)