do not allow GA to upgrade Python past 3.11 #941

Job	Run time
test_distros_shared (ubuntu:22.04)	8m 9s
test_distros_bundled (amazonlinux:2022)	22m 19s
test_distros_shared (ubuntu:20.04)	8m 34s
test_node (14, shared)	5m 54s
bundled_gdal_coverage	13m 30s
test_distros_shared (debian:bullseye)	5m 29s
test_node (14, bundled)	26m 19s
test_distros_shared (fedora:37)	6m 58s
test_node (16, shared)	9m 13s
test_distros_shared (centos:stream8)	10m 29s
test_node (16, bundled)	31m 2s
test_node (18, shared)	5m 24s
test_asan	17m 9s
test_mac (14.x)	25m 58s
test_node (18, bundled)	31m 25s
test_mac (16.x)	26m 57s
test_node (20, shared)	6m 3s
test_mac (18.x)	29m 40s
test_mac_debug	24m 59s
test_node (20, bundled)	26m 11s
test_win (14.x)	27m 25s
test_mac (20.x)	27m 38s
test_win (16.x)	38m 18s
test_win (18.x)	19m 47s
test_win (20.x)	36m 37s
test_win_debug	27m 58s
	8h 39m 25s

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