node: Upgrade to Go 1.26 #3478

Job	Run time
build-docker	2m 5s
e2e-tests (ictest-slashing-params-update-vaa)	3m 56s
e2e-tests (ictest-cw-wormhole)	8m 50s
e2e-tests (ictest-validator-hotswap)	4m 24s
e2e-tests (ictest-upgrade)	9m 23s
e2e-tests (ictest-cw-shutdown-contracts)	6m 35s
e2e-tests (ictest-cancel-upgrade)	4m 17s
e2e-tests (ictest-wormchain)	7m 24s
	46m 54s

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