Optimize dependabot updates to group minor and patch updates into single PRs

[Copilot]

This PR optimizes the dependabot configuration to reduce PR noise by grouping minor and patch updates together while keeping major updates separate for careful review.

Problem

The current dependabot configuration creates individual pull requests for every dependency update, leading to:

• High volume of PRs for routine minor/patch updates
• Increased maintenance overhead
• Cluttered PR list making it harder to identify important changes

Solution

Modified .github/dependabot.yml to add dependency grouping using the groups feature:

groups:
  minor-and-patch-updates:
    patterns:
      - "*"
    update-types:
      - "minor"
      - "patch"

This configuration is applied to both GitHub Actions and NuGet package ecosystems.

Expected Behavior

Before: Separate PRs for each dependency update

• PR Bump Verify.Xunit from 28.9.0 to 29.2.0 #1: Update xunit from 2.9.2 to 2.9.3
• PR Bump Microsoft.NETFramework.ReferenceAssemblies and Roslynator.Analyzers #2: Update FluentAssertions from 8.5.0 to 8.6.0
• PR Bump Nuke.Common from 9.0.3 to 9.0.4 #3: Update StyleCop.Analyzers from 1.2.0-beta.555 to 1.2.0-beta.556

After: Grouped PRs for minor/patch updates

• PR Bump Verify.Xunit from 28.9.0 to 29.2.0 #1: Update dependencies (minor and patch)
  • xunit: 2.9.2 → 2.9.3
  • FluentAssertions: 8.5.0 → 8.6.0
  • StyleCop.Analyzers: 1.2.0-beta.555 → 1.2.0-beta.556

Major updates will still create individual PRs to ensure proper review of potentially breaking changes.

Benefits

• Reduced PR volume: Multiple minor/patch updates combined into single PRs
• Maintained safety: Major version updates still get individual review
• Same schedule: Preserves existing weekly Monday update schedule
• Comprehensive coverage: Applies to all dependencies using wildcard pattern

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[github-actions]

Test Results

84 tests  ±0   84 ✅ ±0   0s ⏱️ ±0s
 3 suites ±0    0 💤 ±0 
 3 files   ±0    0 ❌ ±0 

Results for commit 46c4523. ± Comparison against base commit f10e671.

[coveralls]

Pull Request Test Coverage Report for Build 17092986470

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 96.341%

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Totals
Change from base Build 17074820597:	0.0%
Covered Lines:	172
Relevant Lines:	180

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💛 - Coveralls