chore: [jenkins/ssh-agent] Bump Docker image tag in "docker-compose.y...

... aml"

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Author: github-actions[bot]

docker-compose.yaml

@@ -121,7 +121,7 @@ services:
   # The healthcheck command for each agent checks if the authorized_keys file exists in the /home/jenkins/.ssh directory.
   # The /home/jenkins/.ssh directory in each agent container is mapped to the agent-ssh-dir volume on the host.
   default_agent:
-    image: jenkins/ssh-agent:6.20.0-jdk21
+    image: jenkins/ssh-agent:6.21.0-jdk21
     container_name: desktop-jenkins_agent-1
     profiles:
       - default