Pin proj and fix numpy-update-related test failures#2326
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Thanks @mo-AliceLake 👍
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Addresses #2325
Updating proj from 9.7.1 to 9.8.0 modifies several upstream coordinate‑transformation behaviours, resulting in output changes that cause multiple IMPROVER unit tests to fail (see issue for full description).
While working on this, running latest.yml (which has numpy unpinned) pulled in a newer numpy version, which caused further test failures unrelated to proj and then needed additional fixes.
This PR therefore:
Testing:
CLA