ci: add groups for `dependabot`

[DmitriyLewen]

Description

Dependabot PRs grouping:

• GH actions
• Docker files
• github.com/docker/* from go.mod.
• github.com/aws/* from go.mod.
• github.com/testcontainers-go/* from go.mod.
• others

Example:

Checklist

• [x] I've read the guidelines for contributing to this repository.
• [x] I've followed the conventions in the PR title.
• [ ] I've added tests that prove my fix is effective or that my feature works.
• [ ] I've updated the documentation with the relevant information (if needed).
• [ ] I've added usage information (if the PR introduces new options)
• [ ] I've included a "before" and "after" example to the description (if the PR is a user interface change).