Pin `keras` version to 3.5.0 (#462) #687

Job	Run time
Check Linting	20s
Check Manifest	17s
Run brainmapper tests to check for breakages	12m 37s
Run tests with numba disabled	14m 47s
Run package tests (ubuntu-latest, 3.10)	6m 7s
Run package tests (ubuntu-latest, 3.11)	6m 14s
Run package tests (ubuntu-latest, 3.12)	11m 16s
Run package tests (macos-latest, 3.12)	4m 2s
Run package tests (windows-latest, 3.12)	7m 49s
Build source distribution and wheel	0s
Publish build distributions	0s
	1h 3m 29s

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