chore(dependabot): consolidate updates using groups

[cesarcoatl]

Summary by Sourcery

Enhancements:

• Group Dependabot updates for Coatl Dev actions and workflows across supported maintenance branches.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Dependabot now groups Coatl Dev action and workflow updates into consolidated monthly pull requests for both the 8.3 and 8.1 target branches, reducing the number of dependency update PRs.

File-Level Changes

Change	Details	Files
Configure Dependabot to consolidate related Coatl Dev dependency updates into grouped pull requests.	Add action dependency grouping for coatl-dev/actions/**. Add workflow dependency grouping for coatl-dev/workflows/**. Apply identical grouping configuration to the monthly update jobs targeting branches 8.3 and 8.1.	.github/dependabot.yml

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

Sourcery assessment

Approved.

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