Disable gcc-4.8 since node20 is now required (#356) #565

Job	Run time
custom-install-linux	11s
custom-install-win	3m 0s
default-linux	11s
default-linux-with-examples	15s
default-win	2m 41s
min-req	9m 15s
no-base64	7s
no-pico	7s
preset-support-but-not-enough	11m 36s
root-hint-install-linux	12s
with-libressl	1m 22s
with-wolfssl	49s
with-hunter	3m 0s
	32m 46s

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