Update actions/download-artifact action to v4.2.1

Author: renovate[bot]

.github/workflows/build.yml

@@ -70,7 +70,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: "Download Artefact"
-        uses: actions/download-artifact@v4.1.8
+        uses: actions/download-artifact@v4.2.1
         with:
           path: "./Artefacts"
       - name: "Publish Test Summary"
@@ -91,7 +91,7 @@ jobs:
     runs-on: windows-latest
     steps:
       - name: "Download Artefact"
-        uses: actions/download-artifact@v4.1.8
+        uses: actions/download-artifact@v4.2.1
         with:
           name: "windows-latest"
       - name: "Dotnet NuGet Add Source"
@@ -111,7 +111,7 @@ jobs:
     runs-on: windows-latest
     steps:
       - name: "Download Artefact"
-        uses: actions/download-artifact@v4.1.8
+        uses: actions/download-artifact@v4.2.1
         with:
           name: "windows-latest"
       - name: "Dotnet NuGet Push"