pin deploy pages ubuntu version (#368) #211

Job	Run time
formatting	1m 17s
test (noetic)	15m 38s
lint	27m 42s
test (galactic)	12m 9s
test (humble)	8m 52s
full_conan_installation (3.8)	14m 8s
full_conan_installation (3.9)	15m 7s
full_conan_installation (3.10)	13m 28s
full_conan_installation (3.11)	13m 47s
full_conan_installation (3.12, manylinux_2_31_x86_64, conanio/gcc10:latest)	12m 54s
	2h 15m 2s

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