Update dependency on elastic-package

[mtojek]

This PR updates dependency on elastic-package to include changes around rendering of units and metric types for exported fields table.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• If I'm introducing a new feature, I have modified the Kibana version constraint in my package's manifest.yml file to point to the latest Elastic stack release (e.g. ^7.13.0).

[elasticmachine]

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Build stats

• Build Cause: Pull request #1028 updated

• Start Time: 2021-05-28T11:51:30.641+0000

• Duration: 37 min 11 sec

• Commit: ef32a0b

Test stats 🧪

Test	Results
Failed	0
Passed	2155
Skipped	3
Total	2158

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[mtojek]

self-approved