Flaky: increase boot timeout

[mtojek]

The main build job just failed because of slow agent startup. This PR increases the boot timeout.

[elasticmachine]

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Build stats

• Start Time: 2021-12-22T13:52:52.981+0000

• Duration: 23 min 22 sec

• Commit: fb56a01

Test stats 🧪

Test	Results
Failed	0
Passed	451
Skipped	0
Total	451

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[mtojek]

self-approved.