Merge pull request #1049 from buildkite/db/agent-update-3.39.0

Bump buildkite-agent to v3.39.0

Author: dabarrell

packer/linux/scripts/install-buildkite-agent.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 set -eu -o pipefail
 
-AGENT_VERSION=3.38.0
+AGENT_VERSION=3.39.0
 
 MACHINE="$(uname -m)"
 

packer/windows/scripts/install-buildkite-agent.ps1

@@ -1,7 +1,7 @@
 # Stop script execution when a non-terminating error occurs
 $ErrorActionPreference = "Stop"
 
-$AGENT_VERSION = "3.38.0"
+$AGENT_VERSION = "3.39.0"
 
 Write-Output "Creating bin dir..."
 New-Item -ItemType directory -Path C:\buildkite-agent\bin