[MNT,ENH] Update to allow Python 3.13

[MatthewMiddlehurst]

Updates to Python 3.13. Workflows now use the new middle version, 3.11.

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I have added the following labels to this PR based on the title: [ $\color{#FEF1BE}{\textsf{enhancement}}$, $\color{#EC843A}{\textsf{maintenance}}$ ].
I have added the following labels to this PR based on the changes made: [ $\color{#2C2F20}{\textsf{testing}}$ ]. Feel free to change these if they do not properly represent the PR.

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