Update GitHub Artifact Actions to v4

Author: renovate[bot]

.github/workflows/build.yml

@@ -84,7 +84,7 @@ jobs:
     - name: Pack
       run: dotnet pack --no-build -c Release /p:PackageOutputPath=${{env.BUILD_ARTIFACT_PATH}}
     - name: Publish artifacts
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: ${{matrix.os}}
         path: ${{env.BUILD_ARTIFACT_PATH}}
@@ -97,7 +97,7 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v4
     - name: Download coverage reports
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4
     - name: Install ReportGenerator tool
       run: dotnet tool install -g dotnet-reportgenerator-globaltool
     - name: Prepare coverage reports
@@ -108,7 +108,7 @@ jobs:
         file: Cobertura.xml
         fail_ci_if_error: false
     - name: Save combined coverage report as artifact
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: coverage-report
         path: Cobertura.xml
@@ -125,7 +125,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: 'Download build'
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: 'ubuntu-latest'
       - name: 'Add NuGet source'
@@ -143,7 +143,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: 'Download build'
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: 'ubuntu-latest'
       - name: 'Upload NuGet package'