chore: update docker to node18

[OlafConijn]

closes #544

[github-actions]

File	Coverage
All files	50%	✅
src/aws-provider/aws-account-access.ts	27%	❌
src/aws-provider/aws-events.ts	68%	✅
src/aws-provider/aws-organization-reader.ts	11%	❌
src/aws-provider/aws-organization-writer.ts	3%	❌
src/aws-provider/aws-organization.ts	56%	✅
src/aws-provider/util.ts	16%	❌
src/build-tasks/build-configuration.ts	60%	✅
src/build-tasks/build-runner.ts	14%	❌
src/build-tasks/build-task-provider.ts	49%	✅
src/build-tasks/tasks/annotate-organization-task.ts	21%	❌
src/build-tasks/tasks/annotate-organization.ts	28%	❌
src/build-tasks/tasks/include-task.ts	51%	✅
src/build-tasks/tasks/update-organization-task.ts	62%	✅
src/build-tasks/tasks/update-stacks-task.ts	67%	✅
src/cfn-binder/cfn-binder.ts	74%	✅
src/cfn-binder/cfn-sub-expression.ts	78%	✅
src/cfn-binder/cfn-task-provider.ts	9%	❌
src/cfn-binder/cfn-task-runner.ts	49%	✅
src/cfn-binder/cfn-template.ts	85%	✅
src/cfn-binder/cfn-validate-task-provider.ts	26%	❌
src/change-set/change-set-provider.ts	55%	✅
src/commands/base-command.ts	34%	❌
src/commands/create-organization-changeset.ts	92%	✅
src/commands/delete-stacks.ts	41%	✅
src/commands/describe-stacks.ts	95%	✅
src/commands/init-organization-pipeline.ts	56%	✅
src/commands/init-organization.ts	68%	✅
src/commands/perform-tasks.ts	52%	✅
src/commands/print-org.ts	64%	✅
src/commands/print-stacks.ts	47%	✅
src/commands/print-tasks.ts	54%	✅
src/commands/remove.ts	49%	✅
src/commands/update-organization.ts	65%	✅
src/commands/update-stacks.ts	59%	✅
src/commands/validate-organization.ts	26%	❌
src/commands/validate-stacks.ts	82%	✅
src/commands/validate-tasks.ts	54%	✅
src/core/cfn-expression-resolver.ts	70%	✅
src/core/default-task-runner.ts	65%	✅
src/core/generic-task-runner.ts	80%	✅
src/core/cfn-functions/cfn-cmd.ts	33%	❌
src/core/cfn-functions/cfn-find-in-map.ts	43%	✅
src/core/cfn-functions/cfn-functions.ts	94%	✅
src/core/cfn-functions/cfn-join.ts	40%	✅
src/core/cfn-functions/cfn-md5.ts	44%	✅
src/core/cfn-functions/cfn-merge.ts	20%	❌
src/core/cfn-functions/cfn-read-file.ts	58%	✅
src/core/cfn-functions/cfn-select.ts	15%	❌
src/core/cfn-functions/cfn-sub.ts	33%	❌
src/org-binder/org-binder.ts	48%	✅
src/org-binder/org-task-runner.ts	40%	✅
src/org-binder/org-tasks-provider.ts	17%	❌
src/parser/parser.ts	83%	✅
src/parser/validator.ts	73%	✅
src/parser/model/account-resource.ts	76%	✅
src/parser/model/cloudformation-resource.ts	89%	✅
src/parser/model/master-account-resource.ts	68%	✅
src/parser/model/organization-bindings-section.ts	95%	✅
src/parser/model/organization-root-resource.ts	80%	✅
src/parser/model/organization-section.ts	92%	✅
src/parser/model/password-policy-resource.ts	92%	✅
src/parser/model/resource.ts	96%	✅
src/parser/model/resources-section.ts	90%	✅
src/plugin/plugin-binder.ts	70%	✅
src/plugin/plugin-command.ts	85%	✅
src/plugin/plugin-task.ts	14%	❌
src/plugin/plugin-util.ts	42%	✅
src/plugin/impl/cdk-build-task-plugin.ts	52%	✅
src/plugin/impl/rp-build-task-plugin.ts	26%	❌
src/plugin/impl/s3-copy-build-task-plugin.ts	20%	❌
src/plugin/impl/sls-build-task-plugin.ts	49%	✅
src/plugin/impl/tf-apply-task-plugin.ts	14%	❌
src/state/persisted-state.ts	65%	✅
src/state/storage-provider.ts	19%	❌
src/util/aws-util.ts	14%	❌
src/util/child-process-util.ts	16%	❌
src/util/console-util.ts	54%	✅
src/util/credentials-provider-partition.ts	22%	❌
src/util/file-util.ts	39%	❌
src/util/global-state.ts	27%	❌
src/util/initial-commit-util.ts	25%	❌
src/util/md5-util.ts	17%	❌
src/util/resource-util.ts	93%	✅
src/writer/default-template-writer.ts	73%	✅
src/yaml-cfn/index.ts	55%	✅
src/yaml-cfn/nunjucks-parse-includes.ts	67%	✅

Minimum allowed coverage is 40%

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