update sys to resolve go1.17 build error (algorand#3157)

Summary

@barnjamin mentioned in algorand#2899 that labstack/gommon/issues/46 has a similar issue.

Should be fixed by up version of sys. Closing algorand#2899.

go.mod

@@ -46,7 +46,7 @@ require (
 	golang.org/x/crypto v0.0.0-20200820211705-5c72a883971a
 	golang.org/x/net v0.0.0-20200904194848-62affa334b73
 	golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208 // indirect
-	golang.org/x/sys v0.0.0-20200905004654-be1d3432aa8f
+	golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c
 	google.golang.org/appengine v1.6.7 // indirect
 	gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f // indirect
 	gopkg.in/sohlich/elogrus.v3 v3.0.0-20180410122755-1fa29e2f2009

go.sum

@@ -186,6 +186,8 @@ golang.org/x/sys v0.0.0-20200413165638-669c56c373c4/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200826173525-f9321e4c35a6/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200905004654-be1d3432aa8f h1:Fqb3ao1hUmOR3GkUOg/Y+BadLwykBIzs5q8Ez2SbHyc=
 golang.org/x/sys v0.0.0-20200905004654-be1d3432aa8f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c h1:F1jZWGFhYfh0Ci55sIpILtKKK8p3i2/krTr0H1rg74I=
+golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=