Fix: dictionary changed size during iteration

[hoh]

Iterating over the keys of a dictionary is a lazy operation that uses a generator under the hood.

An error was reported on Sentry due to "RuntimeError: dictionary changed size during iteration". Error on Sentry

This error was introduced by @nesitor on PR https://github.com/aleph-im/aleph-vm/pull/679

Self proofreading checklist

• [x] The new code clear, easy to read and well commented.
• [x] New code does not duplicate the functions of builtin or popular libraries.
• [x] An LLM was used to review the new code and look for simplifications.
• [ ] New classes and functions contain docstrings explaining what they provide.
• [ ] All new code is covered by relevant tests.
• [ ] Documentation has been updated regarding these changes.

Changes

This fixes the issue by transforming the generator into a list, which is the standard way to approach this issue in Python.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 62.20%. Comparing base (7ee7d04) to head (52f5767). Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/aleph/vm/orchestrator/tasks.py	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #699 +/- ## ======================================= Coverage 62.20% 62.20% ======================================= Files 69 69 Lines 6073 6073 Branches 641 641 ======================================= Hits 3778 3778 Misses 2143 2143 Partials 152 152 ```

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