Refactor Hessian update

[shoubhikraj]

Puts the hessian update into the coordinate object. This is for consistency with the update_h_from_cart_h method and for future modification of the optimiser loop.

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Checklist

• [x] The changes include an associated explanation of how/why
• [x] Test pass
• [x] Documentation has been updated
• [x] Changelog has been updated

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.39%. Comparing base (2b3e772) to head (a314726).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## v1.4.3 #337 +/- ## ========================================== + Coverage 97.38% 97.39% +0.01% ========================================== Files 200 200 Lines 23064 23062 -2 ========================================== + Hits 22461 22462 +1 + Misses 603 600 -3 ``` | [Flag](https://app.codecov.io/gh/duartegroup/autodE/pull/337/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=duartegroup) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/duartegroup/autodE/pull/337/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=duartegroup) | `97.39% <100.00%> (+0.01%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=duartegroup#carryforward-flags-in-the-pull-request-comment) to find out more.

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[shoubhikraj]

@t-young31 Hi, do you know why the macOS jobs are failing even without starting tests? I did not change anything in the github builds directory

[t-young31]

looks like https://github.com/conda-incubator/setup-miniconda/issues/344

[shoubhikraj]

@t-young31 I found a bug and included the fix in this PR, could you please have another look before merge?