Bump ssh-agent version to 8.6.0-jdk21

[github-actions]

Bump Docker image tag for "jenkins/ssh-agent"

[jenkins/ssh-agent] Bump Docker image tag in "build-docker-compose.yaml"

change detected: * key "$.services.default_agent.image" updated from "jenkins/ssh-agent:8.5.0-jdk21" to "jenkins/ssh-agent:8.6.0-jdk21", in file "build-docker-compose.yaml"

[jenkins/ssh-agent] Bump Docker image tag in "dockerfiles/cpp/Dockerfile"

changed lines [1] of file "dockerfiles/cpp/Dockerfile"

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

change detected: * key "$.services.default_agent.image" updated from "jenkins/ssh-agent:8.5.0-jdk21" to "jenkins/ssh-agent:8.6.0-jdk21", in file "docker-compose.yaml"

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