Pull in the http.server vulnerability fix from python/cpython#87389

Merged Julian Berman requested to merge branch/http_server_vuln_fix into branch/py3.8

Fixes an open redirection vulnerability for paths starting with //.

See https://github.com/python/cpython/issues/87389

Closes: #3812 (closed)

--HG-- branch : http_server_vuln_fix

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