flake: cli TestScheduleOverride/extend

[mafredri]

https://github.com/coder/coder/actions/runs/14303297012/job/40081684662?pr=17271#step:7:626

    ptytest.go:167: 2025-04-07 07:30:15.048: cmd: read error: match deadline exceeded: context deadline exceeded (wanted "2025-04-07T22:"; got "           2025-04-07T23:00:00+05:30  \r\n")
    ptytest.go:167: 
        	Error Trace:	/home/runner/work/coder/coder/pty/ptytest/ptytest.go:372
        	            				/home/runner/work/coder/coder/pty/ptytest/ptytest.go:196
        	            				/home/runner/work/coder/coder/pty/ptytest/ptytest.go:167
        	            				/home/runner/work/coder/coder/pty/ptytest/ptytest.go:162
        	            				/home/runner/work/coder/coder/pty/ptytest/ptytest.go:149
        	            				/home/runner/work/coder/coder/cli/schedule_test.go:374
        	Error:      	read error
        	Test:       	TestScheduleOverride/extend
        	Messages:   	match deadline exceeded: context deadline exceeded (wanted "2025-04-07T22:"; got "           2025-04-07T23:00:00+05:30  \r\n")

[spikecurtis]

Another case: https://github.com/coder/coder/runs/40081684662