ci(github): upgrade actions/*-artifact@v4

Author: iseki0

.github/workflows/build.yml

@@ -58,7 +58,7 @@ jobs:
         run: mv out/murphysec-${{ matrix.goos }}-${{ matrix.goarch }} out/murphysec-${{ matrix.goos }}-${{ matrix.goarch }}.exe
 
       - name: Upload artifacts
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: murphysec-${{ matrix.goos }}-${{ matrix.goarch }}
           path: out/*
@@ -70,7 +70,7 @@ jobs:
       - build
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
 
       - name: Show files
         run: |