chore(deps): update weight-custody-manifest requirement (#78)

Updates the requirements on [weight-custody-manifest](https://github.com/agentrust-io/examples) to permit the latest version.
- [Commits](https://github.com/agentrust-io/examples/commits)

---
updated-dependencies:
- dependency-name: weight-custody-manifest
  dependency-version: 0.25.0
  dependency-type: direct:production
...

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Author: dependabot[bot]

weight-custody-manifest/requirements.txt

@@ -1,4 +1,4 @@
 # The Weight Custody Manifest reference SDK, from PyPI.
 # Covers the offline examples. provenance_model_signing.py additionally needs the
 # [model-signing] extra: pip install "weight-custody-manifest[model-signing]".
-weight-custody-manifest>=0.23.0
+weight-custody-manifest>=0.25.0