chore: upgrade ubuntu to latest version in CI #1111

Job	Run time
build (ubuntu-latest, linux_openresty, lua-resty-worker-events, t/http3/admin)	13m 33s
build (ubuntu-latest, linux_openresty, lua-resty-worker-events, t/plugin/[a-k]*)	21m 12s
build (ubuntu-latest, linux_openresty, lua-resty-worker-events, t/plugin/[l-z]*)	21m 12s
build (ubuntu-latest, linux_openresty, lua-resty-worker-events, t/admin t/cli t/config-center-yam...	21m 13s
build (ubuntu-latest, linux_openresty, lua-resty-worker-events, t/node t/pubsub t/router t/script...	21m 14s
build (ubuntu-latest, linux_openresty, lua-resty-events, t/http3/admin)	14m 43s
build (ubuntu-latest, linux_openresty, lua-resty-events, t/plugin/[a-k]*)	21m 12s
build (ubuntu-latest, linux_openresty, lua-resty-events, t/plugin/[l-z]*)	21m 15s
build (ubuntu-latest, linux_openresty, lua-resty-events, t/admin t/cli t/config-center-yaml t/con...	21m 11s
build (ubuntu-latest, linux_openresty, lua-resty-events, t/node t/pubsub t/router t/script t/secr...	21m 13s
	3h 17m 58s

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