Disable symtridiagonal s-kwarg test #231

Job	Run time
Documentation	1m 36s
Julia 1.10 - ubuntu-latest - x64 - push	3m 41s
Julia 1.10 - macos-latest - x64 - push	4m 24s
Julia 1.10 - windows-latest - x64 - push	4m 41s
Julia 1 - ubuntu-latest - x64 - push	5m 30s
Julia 1 - macos-latest - x64 - push	5m 58s
Julia 1 - windows-latest - x64 - push	6m 25s
Julia 1 - macos-latest - arm64 - push	4m 1s
Julia nightly - ubuntu-latest - x64 - push	1m 55s
Julia nightly - macos-latest - x64 - push	2m 53s
Julia nightly - windows-latest - x64 - push	2m 29s
	43m 33s

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