Maintenance: group `typedoc` and its plugin together in Dependabot

[dreamorosi]

Summary

Whenever a new "major"* TypeScritpt version is released, typedoc the module we use to render API docs needs to be upgraded to support it. The same is true for any of the typedoc-* plugins, which usually target a specific Typedoc version.

We should add a new dependency group to the Dependabot configuration so that they're all upgraded together.

• TS doesn't follow semver, instead minor versions are to be considered akin to major ones.

Why is this needed?

Because otherwise the PRs are created individually, which causes noise and the Dependabot PR to fill until all the relevant modules are ready to be upgraded. This way we will get a single PR for all the packages and avoid this:

Which area does this relate to?

Automation

Solution

No response

Acknowledgment

• This request meets Powertools for AWS Lambda (TypeScript) Tenets
• Should this be considered in other Powertools for AWS Lambda languages? i.e. Python, Java, and .NET

Future readers

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[github-actions]

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