security: pin GitHub Actions to reviewed SHAs

[mkarson1997]

What changed

• pin checkout in CI and CodeQL workflows to a reviewed immutable commit
• pin setup-dotnet to the reviewed v4 commit
• upgrade/pin CodeQL from mutable v3 tags to the reviewed v4 commit
• preserve the existing Windows/.NET 8 restore, build and C# security-analysis behavior

Why

KARZOUN ERP is a flagship .NET desktop project. Its validation and security-analysis supply chain should not depend on mutable GitHub Action tags.

Merge only after the Windows build, CodeQL and SonarQube Cloud checks are green.

Summary by Sourcery

Harden GitHub Actions supply-chain integrity by replacing mutable workflow tags with reviewed immutable commits.

Enhancements:

• Pin GitHub Actions used by CI and CodeQL workflows to reviewed immutable commits while retaining the existing .NET 8 build and C# security analysis behavior.

CI:

• Update checkout, .NET setup, and CodeQL workflow actions to reviewed commit SHAs, including the CodeQL v4 release.

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Replaces mutable GitHub Actions tags with reviewed immutable commit SHAs across CI and CodeQL workflows, upgrades CodeQL actions to v4, and preserves the existing .NET 8 build and C# security-analysis configuration.

File-Level Changes

Change	Details	Files
Pin CI workflow dependencies to immutable, reviewed GitHub commit SHAs while retaining the existing Windows/.NET 8 validation behavior.	Pin checkout to the reviewed commit in CI and CodeQL workflows. Pin setup-dotnet to the reviewed v4 commit. Keep the .NET 8 SDK configuration unchanged.	.github/workflows/ci.yml .github/workflows/codeql.yml
Upgrade CodeQL workflow actions to the reviewed v4 commit.	Pin CodeQL initialization, autobuild, and analysis actions to one reviewed immutable commit. Preserve C# security-extended queries and analysis categorization.	.github/workflows/codeql.yml

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