[Snyk] Security upgrade protobuf from 4.24.4 to 6.33.5

[bozza-man]

Snyk has created this PR to fix 1 vulnerabilities in the pip dependencies of this project.

Snyk changed the following file(s):

• demo/tf-requirements.txt

⚠️ Warning

streamlit 1.23.1 requires protobuf, which is not installed.

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[sentry]

Bug: The added protobuf>=6.33.5 requirement is incompatible with TensorFlow's dependency on protobuf<3.20, which will cause the demo installation to fail.
_{Severity: CRITICAL}

Suggested Fix

Remove the protobuf>=6.33.5 requirement from demo/tf-requirements.txt. The correct version of protobuf will be installed as a transitive dependency of TensorFlow. If a specific version is needed for another package, it must be compatible with TensorFlow's requirement (e.g., protobuf<3.20).

Prompt for AI Agent

Review the code at the location below. A potential bug has been identified by an AI
agent.
Verify if this is a real issue. If it is, propose a fix; if not, explain why it's not
valid.

Location: demo/tf-requirements.txt#L3

Potential issue: The `demo/tf-requirements.txt` file is updated to require
`protobuf>=6.33.5`. However, the demo also installs `python-doctr[tf]`, which depends on
TensorFlow (`>=2.11.0,<3.0.0`). TensorFlow versions in this range, such as 2.11, require
an older version of protobuf (`<3.20`). This creates an unsolvable dependency conflict
that will cause the `pip` installation to fail, rendering the TensorFlow demo
non-installable and unusable. The project's own `api/pyproject.toml` already pins
`protobuf` to `<=3.20.2` to avoid similar errors, indicating this is a known constraint.

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