[cef] Update ECS to 1.12

[marc-gr]

Automated PR.

Updates ECS to v1.12 and does the required changes to the package.

[elasticmachine]

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

[elasticmachine]

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Build stats

• Start Time: 2021-09-23T09:20:20.244+0000

• Duration: 13 min 44 sec

• Commit: 71894b5

Test stats 🧪

Test	Results
Failed	0
Passed	84
Skipped	0
Total	84

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[marc-gr]

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