MAINT: upgrade anaconda=2025.06 and python=3.13

[mmcky]

This PR upgrades

• ananconda=2025.06
• python=3.13

and associated compatible build infrastructure.

Tasks

• migrate to use lychee for link checking
• migrate figure to image in exercises
• merge the np.sum -> @ updates
• [interpolation] Package is outdated and cannot install #223
• [match_transport] upgrades required for compatibility with numpy>=2 #225
• [amss2, amss3] lecture needs to be updated for compat with numpy>=2 #224

[mmcky]

• fix execution incompatibilities with anaconda=2025.06 and numpy>=2.0

amss.err.log
amss2.err.log
amss3.err.log
match_transport.err.log

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