Update test2json.go (#2873)
Update test2json.go (#2873)

There have been some updates to test2json.go since
d47526ed777958aa4a2542382e931eb7b3c4c6a9, most notably a fix for
https://github.com/golang/go/issues/40132 that was important enough to
recevie a backport. Update rules_go's copy of test2json.go to the
latest.
bazelbuild/rules_go,bazelbuild/rules_go,bazelbuild/rules_go,bazelbuild/rules_go,bazelbuild/rules_go