Proposed changes to create release v0.7.0-rc.1 of libCellML

[github-actions]

Automated release PR for v0.7.0-rc.1.

Do not merge this PR, it is only for review and testing.
The release process will deal with it when the release is finalised.

[github-actions]

Unit Tests

✅ CI checks passed successfully.

[github-actions]

Documentation Tests

✅ Documentation checks passed successfully.

{
  "end_to_end_test_repo": "libcellml/end-to-end-test-framework",
  "end_to_end_test_tag": "v0.4.0",
  "end_to_end_test_sha": "39bd6045e75b35fa40e160d864e2afd732180cc5",
  "database_repo": "libcellml/libcellml.org-documentation-test-database",
  "database_tag": "v0.3.4",
  "database_sha": "a2672b30d2bfba28d2f64ed3027fb73c381cc128",
  "timestamp": "2026-05-31T08:39:06Z",
  "test_summary": {
    "total_failed": 0,
    “libcellml_asides”: {
      “passed”: 0,
      “failed”: 1
    },
    "libcellml_tutorials": {
      "passed": 20,
      "failed": 0
    }
  }
}