[pfsense] Update ECS to 8.4.0

[leehinman]

Closes #3886

[elasticmachine]

💚 Build Succeeded

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• Start Time: 2022-07-30T03:00:26.069+0000

• Duration: 17 min 19 sec

Test stats 🧪

Test	Results
Failed	0
Passed	45
Skipped	0
Total	45

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[elasticmachine]

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

[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	88.889% (8/9)	👎 -8.243
Classes	88.889% (8/9)	👎 -8.243
Methods	92.063% (58/63)	👍 2.819
Lines	89.409% (650/727)	👎 -1.197
Conditionals	100.0% (0/0)	💚

[kcreddy]

LGTM