[o365] 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: 2021-09-23T09:30:31.770+0000

• Duration: 26 min 21 sec

• Commit: ef29de8

Test stats 🧪

Test	Results
Failed	0
Passed	26
Skipped	0
Total	26

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