`base` bug tracker link is broken

Summary

The bug tracker link for base still points to http://ghc.haskell.org/trac/ghc/newticket?component=libraries/base.

~~There is not a 4.13.0.0 release yet.~~ tracked in #17246 (closed)

Updating link for base bug tracker.

Edited Mar 15, 2020 by parsonsmatt

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