Evaluate transition from Bun to Deno

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We're using Bun right now as the common JavaScript runtime for all the Typescript actions in this repository. With Bun 1.3.0 the project introduced breaking changes and also has a general history of not following semantic versioning. This makes it hard for us to guess if an update is going to break everything in subtle ways or not. NodeJS even with 22.x doesn't yet support Typescript natively, so we should evuate other runtimes.

Deno would fit our requirements and even allow us to fine-tune runtime permissions like network and filesystem access for actions that don't really need it.

Note that this currently doesn't have a high priority.