test

Retire ubuntu-20.04 #1508

Job	Run time
steep-check (head)	33s
check-misc (head)	8s
test-memory (head)	38s
test-ruby (head, master)	5m 51s
test-windows (head)	1m 58s
test-ruby (3.0, master)	6m 35s
ruby-versions / Generate Ruby versions	2s
test-c (head, cc)	12s
test-cpp (head, g++)	13s
test-c (head, gcc)	12s
test (2.5)	30s
test-cpp (head, clang++)	15s
test-c (head, clang)	13s
test (2.6)	28s
test (2.7)	35s
test (3.0)	11s
test (3.1)	16s
test (3.2)	15s
test (3.3)	14s
test (3.4)	17s
test (head)	15s
	19m 51s

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