Make the call to next() in algorithm iteration loop explicit

[MargaretDuff]

Description

Changed this line

CIL/Wrappers/Python/cil/optimisation/algorithms/Algorithm.py

Line 279 in 5749b38

for _ in zip(iters, self):

to make the call to next() (which then calls update) explicit.

Related issues/links

Closes #2063

Checklist

• I have performed a self-review of my code
• I have added docstrings in line with the guidance in the developer guide
• I have updated the relevant documentation
• I have implemented unit tests that cover any new or modified functionality
• CHANGELOG.md has been updated with any functionality change
• Request review from all relevant developers
• Change pull request label to 'Waiting for review'

Contribution Notes

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• The content of this Pull Request (the Contribution) is intentionally submitted for inclusion in CIL (the Work) under the terms and conditions of the Apache-2.0 License
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