Dependabot: Update Actions

[pglombardo]

Description

Have dependabot update the github workflow actions when needed.

Related Issue

Type of Change

• 📚 Examples / docs / tutorials / dependencies update
• 🔧 Bug fix (non-breaking change which fixes an issue)
• 🥂 Improvement (non-breaking change which improves an existing feature)
• 🚀 New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to change)
• 🔐 Security fix

Checklist

• I've written tests (if applicable) for all new methods and classes that I created.
• I've added documentation as necessary so users can easily use and understand this feature/fix.

[Donnerbart]

This has been superseeded by configuring Renovate with our company default configuration:

• Add Renovate configuration #644
• Remove dependabot configuration #649

The GitHub actions have been updated successfully:

• Pin dependencies (master) #646
• Update all major GitHub Actions dependencies to v4 (master) (major) #647