23.3 CI/CD: Fix SignRelease job

[Enmk]

Changelog category (leave one):

• Build/Testing/Packaging Improvement

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

sign_release.py using Path instead of str, as required by s3_helper.py.

Fixes https://github.com/Altinity/ClickHouse/actions/runs/7826936815/job/21356218878:

Traceback (most recent call last):
  File "/home/ubuntu/_work/ClickHouse/ClickHouse/tests/ci/sign_release.py", line 94, in <module>
    main()
  File "/home/ubuntu/_work/ClickHouse/ClickHouse/tests/ci/sign_release.py", line 72, in main
    s3_helper.upload_build_file_to_s3(signed_file_path, s3_path)
  File "/home/ubuntu/_work/ClickHouse/ClickHouse/tests/ci/s3_helper.py", line 126, in upload_build_file_to_s3
    return self._upload_file_to_s3(S3_BUILDS_BUCKET, file_path, s3_path)
  File "/home/ubuntu/_work/ClickHouse/ClickHouse/tests/ci/s3_helper.py", line 60, in _upload_file_to_s3
    if file_path.stat().st_size < 64 * 1024 * 1024:
AttributeError: 'str' object has no attribute 'stat'

[altinity-robot]

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Check name	Description	Status
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