Update dependency on elastic-package

[mtojek]

What does this PR do?

This PR updates dependency on elastic-package and enables semantic validation check for field groups. It corrects the system package not to violate the new check.

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).

Related issues

• Fixes No meta info for groups #1091

[elasticmachine]

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Build stats

• Build Cause: Pull request #1114 event

• Start Time: 2021-06-09T11:23:08.252+0000

• Duration: 35 min 11 sec

• Commit: a5d2c58

Test stats 🧪

Test	Results
Failed	0
Passed	2193
Skipped	4
Total	2197

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