[MNT] Remove `keras` bound

[MatthewMiddlehurst]

Reference Issues/PRs

fixes #1724

What does this implement/fix? Explain your changes.

Removes the version bound on keras (if CI passes).

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[hadifawaz1999]

so good news keras fixed the loading issue and they are waiting for it to be released in keras 3.4.2 https://github.com/keras-team/keras/issues/19976 first issue that mentioned it: https://github.com/keras-team/keras/issues/19921 first pr that tried to fix it: https://github.com/keras-team/keras/pull/19924 second pr that tried to fix it: https://github.com/keras-team/keras/pull/19927 and now the new release is pr is still open once its in main we can re-run your pr on keras bound

[hadifawaz1999]

can we try this now @MatthewMiddlehurst ?

[MatthewMiddlehurst]

feel free to make any changes you want

[hadifawaz1999]

keras 3.5 was released so its all good