Draft for #4051, update of gcp oubound IPs

[remilejeune2]

Why

Closes #4051

What's changed

Add a section at the bottom of the regions page with the new IPs

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See the changed pages:

Platform.sh docs

• [ ] https://remi-gcp-outbounds-ips-yv5zlmi-ucq44jg6ofare.eu-5.platformsh.site/development/regions.html

Upsun docs

• [ ] https://docs.upsun.com.remi-gcp-outbounds-ips-yv5zlmi-ucq44jg6ofare.eu-5.platformsh.site/development/regions.html