Add dependabot spf13 group

[perdasilva]

Description of the change:

Add dependabot dependency group for spf13

Motivation for the change:

Hopefully keep cobra and pflag updated in unison

Reviewer Checklist

• Implementation matches the proposed design, or proposal is updated to match implementation
• Sufficient unit test coverage
• Sufficient end-to-end test coverage
• Docs updated or added to /docs
• Commit messages sensible and descriptive

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[Copilot]

Pull Request Overview

This PR adds a new dependency group configuration for Dependabot to manage spf13 packages (notably cobra and pflag) together. The change ensures that related spf13 dependencies like cobra and pflag are updated in unison rather than separately.

• Adds a new spf13-deps dependency group to the existing Dependabot configuration

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.25%. Comparing base (c78e7ce) to head (e804ccd).
⚠️ Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1777      +/-   ##
==========================================
- Coverage   55.26%   55.25%   -0.01%     
==========================================
  Files         136      136              
  Lines       15973    15973              
==========================================
- Hits         8827     8826       -1     
- Misses       5991     5992       +1     
  Partials     1155     1155              

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