Support PyTorch 2.3.0 (#1467)

[mtar]

Due Diligence

• General:
  • [x] title of the PR is suitable to appear in the Release Notes
• Implementation:
  • [x] unit tests: all split configurations tested
  • [x] unit tests: multiple dtypes tested
  • [x] documentation updated where needed

Description

Backport of PR #1467 into release:

Changes proposed:

• Support latest PyTorch release
• Update ci.yaml
• pytorch: add v2.2, drop v1.11
• fix type bug
• delete legacy code
• ci: explicit version numbers

Type of change

interoperability / bug fix

[github-actions[bot]]

Thank you for the PR!

[codecov[bot]]

Codecov Report

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

Project coverage is 91.77%. Comparing base (6112775) to head (4ae77a5).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## release/1.4.x #1512 +/- ## ================================================= + Coverage 91.58% 91.77% +0.18% ================================================= Files 80 80 Lines 11652 11640 -12 ================================================= + Hits 10672 10683 +11 + Misses 980 957 -23 ``` | [Flag](https://app.codecov.io/gh/helmholtz-analytics/heat/pull/1512/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=helmholtz-analytics) | Coverage Δ | | |---|---|---| | [unit](https://app.codecov.io/gh/helmholtz-analytics/heat/pull/1512/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=helmholtz-analytics) | `91.77% <100.00%> (+0.18%)` | :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=helmholtz-analytics#carryforward-flags-in-the-pull-request-comment) to find out more.

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