Fix multiline release body.

[JDarDagran]

Problem

https://github.com/OpenLineage/OpenLineage/actions/runs/12884960069/job/35922382015 failed.

Solution

Attempt to fix with cat << 'EOM'. Ran same release on my fork: https://github.com/JDarDagran/OpenLineage/actions/runs/12886253929/job/35926430677

Checklist

• You've signed-off your work
• Your pull request title follows our guidelines
• Your changes are accompanied by tests (if relevant)
• Your change contains a small diff and is self-contained
• You've updated any relevant documentation (if relevant)
• Your comment includes a one-liner for the changelog about the specific purpose of the change (not required for changes to tests, docs, or CI config)
• You've versioned the core OpenLineage model or facets according to SchemaVer (if relevant)
• You've added a header to source files (if relevant)

---

SPDX-License-Identifier: Apache-2.0
Copyright 2018-2025 contributors to the OpenLineage project