[Fix] Remove deprecated argument from kernels call

[remi-or]

In version 0.14 the kernels package removed the package_name argument from LocalLayerRepository.__init__ . Since we only support kernels>=0.15.2,<0.16 it means we should remove it as well when creating this class.

No deprecation warning because package_name is inferred internally.

Also added some stubs so that uv is happy.

[github-actions]

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[vasqu]

Ah crap I missed it during the refactor 😢 can we add a test to kernels so we detect this --> no deprecation message