Upgrade GitHub Actions to current Node 24 majors

Author: KSemenenko

.github/steps/install_dependencies/action.yml

@@ -24,7 +24,7 @@ runs:
   steps:
     # Install .NET
     - name: Setup .NET SDK from global.json
-      uses: actions/setup-dotnet@v4
+      uses: actions/setup-dotnet@v5
       with:
         global-json-file: 'global.json'
 

.github/workflows/build-validation.yml

@@ -26,7 +26,7 @@ jobs:
     runs-on: windows-latest
     timeout-minutes: 60
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
 
@@ -45,7 +45,7 @@ jobs:
     needs:
       - build
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
 
@@ -64,7 +64,7 @@ jobs:
     needs:
       - build
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
 
@@ -83,7 +83,7 @@ jobs:
     needs:
       - build
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
 

.github/workflows/release-publish.yml

@@ -39,7 +39,7 @@ jobs:
       release_tag: ${{ steps.resolve_version.outputs.release_tag }}
       release_version: ${{ steps.resolve_version.outputs.display_version }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
 
@@ -99,7 +99,7 @@ jobs:
             archive_name: dotpilot-desktop-linux.zip
             output_path: artifacts/publish/linux
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
           ref: ${{ github.sha }}
@@ -142,7 +142,7 @@ jobs:
       - prepare_release
       - publish_desktop
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
           ref: ${{ github.sha }}

github-actions-yaml-review.plan.md

@@ -83,6 +83,13 @@ Review the current GitHub Actions validation and release workflows, record concr
   - `actionlint .github/workflows/release-publish.yml`
   Done when: touched workflow files still parse cleanly.
 
+- [x] Step 8: Remove deprecated Node 20 JavaScript action usage from GitHub workflows.
+  Verification:
+  - upgrade `actions/checkout` usages to the current stable major
+  - upgrade `actions/setup-dotnet` usage in the shared composite action to the current stable major
+  - `actionlint` still passes for both workflows
+  Done when: the workflows no longer pin the deprecated Node 20 action majors reported by GitHub Actions.
+
 ## Full-Test Baseline Step
 
 - [x] Capture the current workflow state before proposing changes.