Update bundle templates to environment version 5

[Hangzhi]

Changes

Update built-in bundle templates to use serverless environment version 5 and refresh their acceptance snapshots.

Why

Environment version 5 has been generally available since February 25, 2026, according to the serverless environment version release notes. Updating the built-in templates to v5 gives newly generated projects the latest serverless environment and the newest, best user experience by default.

Tests

• go test ./libs/template/...
• Focused acceptance coverage for dbt-sql and pipeline init/e2e templates

[github-actions]

An authorized user can trigger integration tests manually by following the instructions below:

Trigger:
go/deco-tests-run/cli

Inputs:

• PR number: 6108
• Commit SHA: 6f670a192176bca72015152ad5cbcdbcca2d0907

Checks will be approved automatically on success.

[github-actions]

Approval status: pending

/acceptance/bundle/ - needs approval

16 files changed
Suggested: @janniklasrose
Also eligible: @denik, @lennartkats-db, @pietern, @shreyas-goenka, @andrewnester, @anton-107

/acceptance/pipelines/ - needs approval

Files: acceptance/pipelines/e2e/output/lakeflow_project/resources/sample_job.job.yml, acceptance/pipelines/init/python/output/my_python_project/resources/sample_job.job.yml, acceptance/pipelines/init/sql/output/my_sql_project/resources/sample_job.job.yml
Suggested: @lennartkats-db
Also eligible: @kanterov, @jefferycheng1

/libs/template/ - needs approval

Files: libs/template/templates/dbt-sql/library/versions.tmpl, libs/template/templates/default-scala/template/{{.project_name}}/resources/{{.project_name}}.job.yml.tmpl, libs/template/templates/default/library/versions.tmpl
Suggested: @janniklasrose
Also eligible: @denik, @lennartkats-db, @pietern, @shreyas-goenka, @andrewnester, @anton-107

General files (require maintainer)

Files: .nextchanges/bundles/default-template-environment-version.md
Based on git history:

• @janniklasrose -- recent work in .nextchanges/bundles/

_{Any maintainer (@andrewnester, @anton-107, @denik, @pietern, @shreyas-goenka, @simonfaltum, @renaudhartert-db, @janniklasrose, @lennartkats-db) can approve all areas.
See OWNERS for ownership rules.}