Decrease workers for hopannotation1 export

[cristinaleonr]

4 workers was causing the number of INODES to drop to zero.
With 3 workers, it doesn't drop below 3mil.

Before:
https://grafana.mlab-sandbox.measurementlab.net/d/XokjBPKnj/annotation-export-monitoring?orgId=1&from=1640195880000&to=1640210280000&var-datasource=Data+Processing+%28mlab-sandbox%29&viewPanel=46

After:
https://grafana.mlab-sandbox.measurementlab.net/d/XokjBPKnj/annotation-export-monitoring?orgId=1&from=1640213760000&to=now&var-datasource=Data+Processing+%28mlab-sandbox%29&viewPanel=46

This change is 

[coveralls]

Pull Request Test Coverage Report for Build 231

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 68.846%

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Totals
Change from base Build 220:	0.0%
Covered Lines:	495
Relevant Lines:	719

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💛 - Coveralls

[stephen-soltesz]

- the volume of traceroute data varies over time. when you run this end to end in staging keep an eye out for the period around when @SaiedKazemi deployed bug fixes to traceroute caller that increased the test volume. He can help identify the likely date. I think it was in June/July timeframe.

Reviewed 1 of 1 files at r2.
Reviewable status: complete! 1 of 1 approvals obtained

[cristinaleonr]

Okay, I will keep an eye out for that!

Reviewable status: complete! 1 of 1 approvals obtained