chore: remove unnecessary try...finally

[OnlyWick]

there are no operations in the notify method that could cause program interruption.

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[developit]

I don't think we can remove this try/catch: without it, a custom ._notify implementation throwing would cause the graph to become incorrect, which would break all signals+computeds in very unexpected ways.

[OnlyWick]

Will it happen when used together with other frameworks? I see in the core that _notify does not throw any errors.