fix package step

[juliaElastic]

Trying to fix package step by using the same condition as docker public step here

[juliaElastic]

I wonder if we should allow any branches in case an older version needs to be built like 8.9
This was the jenkins definition: https://github.com/elastic/fleet-server/blob/main/.ci/Jenkinsfile#L222-L231

[elasticmachine]

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• Start Time: 2023-08-14T12:41:22.974+0000

• Duration: 39 min 52 sec

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Test	Results
Failed	0
Passed	751
Skipped	1
Total	752

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