[riot-notifications] [RIOT-OS/RIOT] gh-actions/release-test: bump ssh-agent to v0.4.1 (#15488)

[Alexandre Abadie]

@aabadie approved this pull request.

Version of ssh-agent used in this PR indeed remove the use of set-env which is the cause of failures on test-on-iotlab action. So the reason is ok and this PR should fix the problem.

ACK



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