Add dependabot group for coverlet packages

[Copilot]

Multiple coverlet NuGet packages updating independently generates noisy, redundant PRs. Grouping them consolidates updates into a single PR.

Changes

• Added a groups entry under the nuget ecosystem in .github/dependabot.yml that matches all coverlet.* packages (e.g. coverlet.collector, coverlet.msbuild)

groups:
  coverlet:
    patterns:
      - "coverlet.*"

Original prompt

---

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 #790

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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