chore(dependabot): add coverlet group

[Copilot]

Groups all coverlet.* NuGet packages into a single dependabot PR instead of one per package.

Description

Adds a coverlet group to the dependabot NuGet configuration to batch all coverlet.* dependency updates into a single pull request.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Other (please describe): Dependabot configuration update

Related Issue(s)

Changes Made

• Added coverlet group under the nuget package ecosystem in .github/dependabot.yml with pattern coverlet.*

Testing

• Unit tests added/updated
• Integration tests added/updated
• Manual testing performed
• All existing tests pass

Checklist

• My code follows the code style of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Versions applicability

• My change applies to the version 1.X of the library, if so PR link:
• My change applies to the version 2.X of the library, if so PR link:
• My change applies to the version 3.X of the library, if so PR link:
• I have evaluated the applicability of my change against the other versions above.

See the contributing guidelines for more information about how patches are applied across multiple versions.

Additional Notes

No functional code changes — config only.

Original prompt

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This section details on the original issue you should resolve

<issue_title>add a dependabot group for coverlet</issue_title>
<issue_description>this will reduce the number of pull requests we get</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes add a dependabot group for coverlet #2786

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud