Add Microsoft.CodeAnalysis.* to dependabot ignore list (#1009)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: eiriktsarpalis <2813363+eiriktsarpalis@users.noreply.github.com>

Author: Copilot

.github/dependabot.yml

@@ -44,6 +44,8 @@ updates:
       - dependency-name: "Microsoft.IdentityModel.*"
       - dependency-name: "Microsoft.Bcl.*"
       - dependency-name: "Microsoft.SourceLink.*"
+      # Ignore Roslyn/CodeAnalysis dependencies to maintain VS 2022 compatibility
+      - dependency-name: "Microsoft.CodeAnalysis.*"
       # Ignore all System product dependencies except those explicitly in testing groups
       - dependency-name: "System.Diagnostics.*"
       - dependency-name: "System.IO.*"