[ti_threatq] Update ECS to 8.4.0

[leehinman]

Update ti_threatq to ECS 8.4.0

Closes #3889

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• Start Time: 2022-08-01T16:07:45.224+0000

• Duration: 15 min 9 sec

Test stats 🧪

Test	Results
Failed	0
Passed	8
Skipped	0
Total	8

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (1/1)	💚 2.868
Classes	100.0% (1/1)	💚 2.868
Methods	91.667% (11/12)	👍 2.211
Lines	59.447% (129/217)	👎 -31.159
Conditionals	100.0% (0/0)	💚

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