chore(pg-v5): upgrade tunnel-ssh

[mble-sfdc]

This commit upgrades tunnel-ssh, in order to upgrade a dependency chain:

• tunnel-ssh -> ssh2 -> cpu-features

This is required as prior to recent releases of cpu-features, which only gained support for Apple Silicon in August 2023. Without this, building this package or packages that depend on it throw non-fatal errors when built.

Ref: https://github.com/heroku/cli/issues/2294

[mble-sfdc]

Needs some testing due to major version upgrade.

[k80bowman]

@mble-sfdc could you please explain a little about how this fix is related to #2294?

[mble-sfdc]

@k80bowman See this comment: https://github.com/heroku/cli/issues/2294#issuecomment-1860473727.

This cpu-features issue crops up a lot.