(CAT-2162) Remove support for SLES 12 #850

Job	Run time
spec (ruby 2.7) / spec	52s
spec (ruby 3.2) / spec	48s
acceptance (ruby 2.7 \| ubuntu-latest) / acceptance	13m 4s
acceptance (ruby 3.2 \| windows-2019) / acceptance	34m 3s
acceptance (ruby 3.2 \| ubuntu-latest) / acceptance	12m 49s
acceptance (ruby 2.7 \| windows-2019) / acceptance	27m 59s
	1h 29m 35s

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