chore(deps): update grafanaagent docker tag to v0.39.1

This MR contains the following updates:

Package	Update	Change
GrafanaAgent	patch	v0.39.0 -> v0.39.1

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Release Notes

grafana/agent (GrafanaAgent)

v0.39.1

Compare Source

Security fixes

• Fixes following vulnerabilities (@​hainenber)
  • GO-2023-2409
  • GO-2023-2412
  • CVE-2023-49568

Bugfixes

• Fix issue where installing the Windows Agent Flow installer would hang then crash. (@​mattdurham)

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