upgrade certificate-transparency-go

[jchorl]

Fixes #1058

Updated using go get -u github.com/google/certificate-transparency-go@96cd4d958d3b86edc38e9f8c673489dc210466da and then go mod vendor

I chose this commit because it added wasm support.

[codecov-io]

Codecov Report

Merging #1059 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #1059   +/-   ##
======================================
  Coverage    56.4%   56.4%           
======================================
  Files          76      76           
  Lines        7256    7256           
======================================
  Hits         4093    4093           
  Misses       2697    2697           
  Partials      466     466

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