Add support for ubuntu-26.04 and ubuntu-26.04-arm #1889

Job	Run time
test-matrix	6s
Check dist/index.js is up-to-date	11s
ubuntu-26.04 jruby-10	1m 38s
ubuntu-26.04 3.3	23s
ubuntu-26.04 3.4	16s
ubuntu-26.04 head	4s
ubuntu-26.04 3.2	22s
ubuntu-26.04 jruby-9	1m 38s
ubuntu-26.04 jruby-head	1m 50s
ubuntu-26.04 truffleruby+graalvm	2m 38s
ubuntu-26.04 truffleruby	52s
ubuntu-26.04-arm 3.4	22s
ubuntu-26.04 truffleruby-head	50s
ubuntu-26.04 4.0	34s
ubuntu-26.04-arm head	5s
ubuntu-26.04-arm 3.2	18s
ubuntu-26.04-arm 3.3	19s
ubuntu-26.04 truffleruby+graalvm-head	3m 35s
ubuntu-26.04-arm 4.0	24s
ubuntu-26.04-arm jruby-10	1m 19s
ubuntu-26.04-arm truffleruby+graalvm-head	3m 2s
ubuntu-26.04-arm jruby-head	1m 23s
ubuntu-26.04-arm jruby-9	1m 15s
ubuntu-26.04-arm truffleruby+graalvm	2m 25s
ubuntu-26.04-arm truffleruby-head	42s
ubuntu-26.04-arm truffleruby	36s
	27m 7s

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