Display tests failing on Julia 1.9

[ssfrr]

Looks like something changed with respect to printing a newline at the end.

1D buf prints prettily: Test Failed at /home/runner/work/SampledSignals.jl/SampledSignals.jl/test/SampleBuf.jl:512
  Expression: String(take!(iobuf)) == expected
   Evaluated: "300-frame, 1-channel SampleBuf{Float64, 1}\n0.00625s sampled at 48000.0Hz\n▆▆▆▆▆▆▆▆▆▆▅▅▅▅▅▅▄▄▃▃▄▄▅▅▅▅▅▅▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▅▅▅▅▅▅▄▄▃▃▄▄▅▅▅▅▅▅▆▆▆▆▆▆▆▆▆▆\n" == "300-frame, 1-channel SampleBuf{Float64, 1}\n0.00625s sampled at 48000.0Hz\n▆▆▆▆▆▆▆▆▆▆▅▅▅▅▅▅▄▄▃▃▄▄▅▅▅▅▅▅▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▆▅▅▅▅▅▅▄▄▃▃▄▄▅▅▅▅▅▅▆▆▆▆▆▆▆▆▆▆"

Stacktrace:
 [1] macro expansion
   @ /opt/hostedtoolcache/julia/1.9.3/x64/share/julia/stdlib/v1.9/Test/src/Test.jl:478 [inlined]
 [2] macro expansion
   @ ~/work/SampledSignals.jl/SampledSignals.jl/test/SampleBuf.jl:512 [inlined]
 [3] macro expansion
   @ /opt/hostedtoolcache/julia/1.9.3/x64/share/julia/stdlib/v1.9/Test/src/Test.jl:1498 [inlined]
 [4] macro expansion
   @ ~/work/SampledSignals.jl/SampledSignals.jl/test/SampleBuf.jl:505 [inlined]
 [5] macro expansion
   @ /opt/hostedtoolcache/julia/1.9.3/x64/share/julia/stdlib/v1.9/Test/src/Test.jl:1498 [inlined]
 [6] top-level scope
   @ ~/work/SampledSignals.jl/SampledSignals.jl/test/SampleBuf.jl:13