app-admin/fluent-bit: Upgrade fluent-bit to v3.0.6 BUG=b/346306142 TEST=Emerge-lakitu RELEASE_NOTE=Upgrade fluent-bit from v1.9.4 to v3.0.6. Change-Id: I4178370d83e97ff87434ff1907f6cff3eac3024e Reviewed-on: https://cos-review.googlesource.com/c/cos/overlays/board-overlays/+/75254 Reviewed-by: Kevin Berry <kpberry@google.com> Tested-by: RBE-prod-presubmit <service-269995278450@remotebuildexecution.iam.gserviceaccount.com>