chore: bump babylon to v0.18.0 and update min unbonding time blocks #120

Job	Run time
go_sec_covenant_signer	1m 20s
docker_pipeline / dockerfile_lint	17s
docker_pipeline / prepare-metadata	1s
docker_pipeline_covenant_signer / prepare-metadata	1s
docker_pipeline_covenant_signer / dockerfile_lint	17s
lint_test / build	1m 20s
lint_test / lint	2m 25s
lint_test / unit-tests	3m 21s
lint_test / check-mock-gen	0s
lint_test / gosec	2m 30s
lint_test / integration-tests	4m 34s
docker_pipeline / docker_build (linux/amd64, ubuntu-24.04)	2m 55s
docker_pipeline / docker_build (linux/arm64, ubuntu-24.04-arm64)	3m 3s
docker_pipeline_covenant_signer / docker_build (linux/amd64, ubuntu-24.04)	1m 20s
docker_pipeline_covenant_signer / docker_build (linux/arm64, ubuntu-24.04-arm64)	1m 31s
docker_pipeline_covenant_signer / merge_dockerhub	0s
docker_pipeline_covenant_signer / merge_ecr	0s
docker_pipeline_covenant_signer / vulnerability_scan	0s
docker_pipeline / merge_ecr	0s
docker_pipeline / merge_dockerhub	0s
docker_pipeline / vulnerability_scan	0s
	24m 55s

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