🔼 Update actions/upload-artifact action to v6

Author: renovate[bot]

.github/workflows/test.yml

@@ -51,7 +51,7 @@ jobs:
         run: go test -v -ldflags '-checklinkname=0' -tags tfogo_checklinkname0 ./...
 
       - name: Upload Binaries
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: shadowsocks-go-${{ github.sha }}-${{ matrix.os }}-${{ runner.arch }}
           path: shadowsocks-go*

.github/workflows/test_gotip.yml

@@ -45,7 +45,7 @@ jobs:
         run: gotip test -v -ldflags '-checklinkname=0' -tags tfogo_checklinkname0 ./...
 
       - name: Upload Binaries
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: shadowsocks-go-${{ github.sha }}-${{ matrix.os }}-${{ runner.arch }}
           path: shadowsocks-go*