add s2k_fo srp protocol support #975 #1242

Job	Run time
skip_check	6s
get_version	52s
lint (3.8)	19s
lint (3.9)	25s
type_check (3.8)	26s
lint (3.10)	23s
type_check (3.9)	54s
lint (3.11)	17s
type_check (3.10)	23s
lint (3.12)	1m 13s
type_check (3.11)	21s
type_check (3.12)	1m 39s
patch_version / patch_version	5s
test (3.8)	50s
test_non_linux (3.12, macos-13)	1m 22s
test (3.9)	43s
test (3.10)	47s
test_non_linux (3.12, macos-14)	31s
test (3.11)	57s
test_non_linux (3.12, windows-2019)	1m 7s
test (3.12)	58s
test_non_linux (3.12, windows-2022)	1m 25s
extract_changelog / extract_changelog	5s
	16m 8s

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