chore(repo): add `@stencil/*` packages to dependabot (#27431)

Issue number: N/A

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## What is the current behavior?
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`@stencil/core` is the only package checked by dependabot

## What is the new behavior?
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this PR. -->

this commit updates the allow list for dependabot to allow additional
stencil-scoped packages. the motivation for this is to allow the other
stencil dependencies used in ionic framework to be automatically bumped
by automation, rather than making it a manual process. this is intended
to help with the stencil v4 rollout, where new versions on stencil
packages (other than core) will be released with early v4 support.

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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## Other information

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I arbitrarily alphabetized the `@stencil/*` section of this allow-list.
LMK if you'd prefer something different here