Update to elastic/beats@5426df01489e

[axw]

Motivation/summary

Update beats dependency.

Beats by default does not use vendoring any more (elastic/beats#18655), so we don't need to override UseVendor in magefile.go.

Checklist

• I have signed the Contributor License Agreement.
  - [ ] I have updated CHANGELOG.asciidoc

I have considered changes for:
- [ ] documentation
- [ ] logging (add log lines, choose appropriate log selector, etc.)
- [ ] metrics and monitoring (create issue for Kibana team to add metrics to visualizations, e.g. Kibana#44001)

• automated tests (add tests for the code changes, all unit tests pass locally)
  - [ ] telemetry
  - [ ] Elasticsearch Service (https://cloud.elastic.co)
  - [ ] Elastic Cloud Enterprise (https://www.elastic.co/products/ece)
  - [ ] Elastic Cloud on Kubernetes (https://www.elastic.co/elastic-cloud-kubernetes)

How to test these changes

make test

Related issues

None.

[apmmachine]

💚 Build Succeeded

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Build stats

• Build Cause: [Pull request #3919 opened]

• Start Time: 2020-06-29T05:43:08.960+0000

• Duration: 47 min 36 sec

Test stats 🧪

Test	Results
Failed	0
Passed	3211
Skipped	147
Total	3358

Steps errors

Expand to view the steps failures

• Name: Compress

  • Description: tar --exclude=coverage-files.tgz -czf coverage-files.tgz coverage

  • Duration: 0 min 0 sec

  • Start Time: 2020-06-29T05:58:54.329+0000

  • log

• Name: Compress

  • Description: tar --exclude=system-tests-linux-files.tgz -czf system-tests-linux-files.tgz system-tests

  • Duration: 0 min 0 sec

  • Start Time: 2020-06-29T06:10:31.721+0000

  • log

• Name: Test Sync

  • Description: ./script/jenkins/sync.sh

  • Duration: 3 min 33 sec

  • Start Time: 2020-06-29T05:53:45.508+0000

  • log