Merge branch 'ps/t7528-ssh-agent-uds-workaround' into maint-2.51

Recent OpenSSH creates the Unix domain socket to communicate with ssh-agent under $HOME instead of /tmp, which causes our test to fail doe to overly long pathname in our test environment, which has been worked around by using "ssh-agent -T". * ps/t7528-ssh-agent-uds-workaround: t7528: work around ETOOMANY in OpenSSH 10.1 and newer