Bump docker/build-push-action from 5 to 6 #5489

Job	Run time
set-tags	3s
cargo-clippy	7m 0s
check-copyright	6s
Check with rustfmt	18s
build	3m 49s
cargo-toml-feature-propagation	1m 50s
toml-formatting	51s
typescript-formatting	29s
typescript-linting	22s
typescript-dancebox-specs	45s
typescript-tests-simple-template	2m 30s
typescript-tests-frontier	3m 58s
Check WASM runtimes with Twiggy	1m 32s
check-api-augment	1m 16s
chopsticks-upgrade-test (stagenet_dancebox, dancebox)	1m 16s
rust-test	5m 46s
chopsticks-upgrade-test (flashbox, flashbox)	1m 2s
typescript-tests	4m 21s
chopsticks-upgrade-test (dancebox, dancebox)	49s
typescript-tests-flashbox	3m 48s
chopsticks-upgrade-test (frontier_template, container-chain-template-frontier)	58s
typescript-tests-relay	4m 13s
chopsticks-upgrade-test (stagelight, dancelight)	58s
zombienet-tests (zombie_tanssi)	9m 40s
zombienet-tests (zombie_tanssi_relay)	12m 32s
zombienet-tests-merge-queue-bridge-e2e	0s
zombienet-test-upgrade (dancebox)	6m 25s
docker-tanssi (tanssi)	34s
zombienet-tests-merge-queue	0s
docker-tanssi (container-chain-simple-template)	22s
docker-tanssi (container-chain-evm-template)	22s
docker-tanssi (starlight)	22s
zombienet-test-upgrade-containers (frontier_template, container-chain-template-frontier)	4m 33s
zombienet-test-upgrade-containers (simple_template, container-chain-template-simple)	7m 2s
zombienet-test-upgrade-starlight (dancelight, dancelight)	1m 9s
Results for zombienet-tests-merge-queue	1s
	1h 31m 2s

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