Bump Jenkins inbound-agent version to 3261.v9c670a_4748a_9-2

[jenkins-infra-updatecli]

Bump Jenkins inbound-agent version

Update the value of ARG JENKINS_AGENT_VERSION in the Dockerfile

changed lines [1] of file "/tmp/updatecli/github/jenkins-infra/docker-packaging/Dockerfile"

3261.v9c670a_4748a_9-2

Release published on the 2024-08-16 10:57:11 +0000 UTC at the url https://github.com/jenkinsci/docker-agent/releases/tag/3261.v9c670a_4748a_9-2

<!-- Optional: add a release summary here -->
## 🚀 New features and improvements

* Add support for Jenkins agent jar file location in the environment variable JENKINS_AGENT_FILE (#860) @zhan9san

## 🐛 Bug fixes

* Bugfix: Fix regression where environment variables set to USER would be lowercased to user. (#857) @aidanleuck

## 📝 Documentation updates

* Add support for Jenkins agent jar file location in the environment variable JENKINS_AGENT_FILE (#860) @zhan9san

## 📦 Dependency updates

* Bump Debian Bookworm Linux version to bookworm-20240812 (#861) @github-actions
* chore(deps): bump archlinux from base-20240728.0.249973 to base-20240804.0.251467 in /archlinux (#856) @dependabot

Jenkins pipeline link

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