[gcp] Add 8.0.0 constraint

[marc-gr]

Automated PR.

Add 8.0.0 constraint.

[elasticmachine]

Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[elasticmachine]

💚 Build Succeeded

the below badges are clickable and redirect to their specific view in the CI or DOCS

Expand to view the summary

Build stats

• Start Time: 2021-11-25T15:04:21.383+0000

• Duration: 18 min 4 sec

• Commit: b7efdc9

Test stats 🧪

Test	Results
Failed	0
Passed	23
Skipped	0
Total	23

🤖 GitHub comments

To re-run your PR in the CI, just comment with:

• /test : Re-trigger the build.