Upgrade golang.org/x/crypto to latest (pushed on Apr 11, 2022).
This commit is the result of running:
```
go get golang.org/x/crypto/ssh@latest \
&& go mod tidy && go mod vendor
```
See https://groups.google.com/g/golang-announce/c/-cp44ypCT5s/m/wmegxkLiAQAJ
**What this PR does / why we need it**:
Upgrades golang.org/x/crypto/ssh to latest, where the vulnerability has been fixed.
6e97c91760