vulncheck: update all.bash
vulncheck: update all.bash

Various fixes are made to the vulncheck/all.bash file.

Change-Id: I9cc0a980f55967aaf66deb9135c62c5b7dd9b44a
Reviewed-on: https://go-review.googlesource.com/c/exp/+/369514
Trust: Julie Qiu <8d32267b6b4884cf35adeaccde2b6857ae11aace@golang.org>
Run-TryBot: Julie Qiu <8d32267b6b4884cf35adeaccde2b6857ae11aace@golang.org>
TryBot-Result: Gopher Robot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Zvonimir Pavlinovic <490af24f3def1258d2f7e9b10b20e341f6c68320@google.com>

golang/exp,golang/exp,golang/exp