Increase test coverage + Fixing bug in `static_call`

[Faisal-Alsrheed]

This PR aims to increase the test coverage +

• Modified the static_call method in keras_core/activations/activations.py to convert the input x to a tensor. This change ensures that all tensor operations within the function operate on consistent tensor types. (Needed to pass all the tests)

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.04% :tada:

Comparison is base (ab45558) 75.99% compared to head (9fb59b6) 76.04%. Report is 6 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #847 +/- ## ========================================== + Coverage 75.99% 76.04% +0.04% ========================================== Files 328 328 Lines 31099 31137 +38 Branches 6051 6061 +10 ========================================== + Hits 23635 23679 +44 + Misses 5866 5863 -3 + Partials 1598 1595 -3 ``` | [Flag](https://app.codecov.io/gh/keras-team/keras-core/pull/847/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=keras-team) | Coverage Δ | | |---|---|---| | [keras_core](https://app.codecov.io/gh/keras-team/keras-core/pull/847/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=keras-team) | `75.95% <100.00%> (+0.03%)` | :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=keras-team#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files Changed](https://app.codecov.io/gh/keras-team/keras-core/pull/847?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=keras-team) | Coverage Δ | | |---|---|---| | [keras\_core/activations/activations.py](https://app.codecov.io/gh/keras-team/keras-core/pull/847?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=keras-team#diff-a2VyYXNfY29yZS9hY3RpdmF0aW9ucy9hY3RpdmF0aW9ucy5weQ==) | `90.82% <100.00%> (+4.71%)` | :arrow_up: | ... and [6 files with indirect coverage changes](https://app.codecov.io/gh/keras-team/keras-core/pull/847/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=keras-team)

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[fchollet]

Thanks for the PR!

To best increase test coverage, I suggest using the codecov reports as a guide: https://app.codecov.io/gh/keras-team/keras-core/tree/main/keras_core

In particular focus on the saving/, utils/, trainers/, models/ namespaces.

[Faisal-Alsrheed]

Thanks for the PR!

To best increase test coverage, I suggest using the codecov reports as a guide: https://app.codecov.io/gh/keras-team/keras-core/tree/main/keras_core

In particular focus on the saving/, utils/, trainers/, models/ namespaces.

Thank you for your feedback.

I have just found out about seeing what line hasn’t been covered inside CodeCov. Very cool tool. Before, It was not easy for me to quickly find out untested lines.

But now I will be more than happy to do this task almost everyday on my free time.