Fix go-ieproxy version

[wardn]

Signed-off-by: ]|[ [email protected]

What is the problem I am trying to address?

$ cd athens/cmd/proxy
$ go build
# github.com/mattn/go-ieproxy
~/go/pkg/mod/github.com/mattn/[email protected]/GetProxyFunc.go:10:9: undefined: proxyMiddleman

How is the fix applied?

$ cd athens
$ go get github.com/mattn/go-ieproxy@latest

What GitHub issue(s) does this PR fix or close?

n/a

[nrwiersma]

Is this still and issue? I cannot reproduce any build issues.

[matt0x6F]

No longer relevant