GHA CI: Update `upload-artifact` action to `v3`

.github/workflows/ci_macos.yaml

@@ -115,7 +115,7 @@ jobs:
           cp libtorrent/build/compile_commands.json upload/cmake/libtorrent
 
       - name: Upload build artifacts
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         with:
           name: build-info_macOS_${{ matrix.qbt_gui }}_libtorrent-${{ matrix.libt_version }}_Qt-${{ matrix.qt_version }}
           path: upload

.github/workflows/ci_ubuntu.yaml

@@ -101,7 +101,7 @@ jobs:
           cp libtorrent/build/compile_commands.json upload/cmake/libtorrent
 
       - name: Upload build artifacts
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         with:
           name: build-info_ubuntu-20.04-x64_${{ matrix.qbt_gui }}_libtorrent-${{ matrix.libt_version }}_Qt-${{ matrix.qt_version }}
           path: upload

.github/workflows/ci_windows.yaml

@@ -154,7 +154,7 @@ jobs:
           copy libtorrent/build/compile_commands.json upload/cmake/libtorrent
 
       - name: Upload build artifacts
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         with:
           name: qBittorrent-CI_Windows-x64_libtorrent-${{ matrix.libt_version }}
           path: upload