workflows: fix update actions to v4

Starting January 30th, 2025, GitHub Actions customers will no
longer be able to use v3. It is necessary to update to v4 to make
the workflows work.
As a consequence duplicated jobs are removed.

Signed-off-by: Flavia Caforio <[email protected]>

.github/workflows/build-app.yml

@@ -31,7 +31,7 @@ jobs:
                 curl -fsSL https://deb.nodesource.com/setup_14.x | bash -
                 apt-get install -y nodejs
           - name: Checkout esp-mqtt
-            uses: actions/checkout@v3
+            uses: actions/checkout@v4
           - name: ccache
             uses: hendrikmuhs/[email protected]
             with:
@@ -46,7 +46,7 @@ jobs:
               cp -r . $IDF_PATH/components/mqtt/esp-mqtt
               IDF_CCACHE_ENABLE=1 idf-build-apps build --config-file ci/idf_build_apps.toml -p ${{inputs.app_path}} -t ${{inputs.target}}
           - name: Upload files to artifacts for run-target job
-            uses: actions/upload-artifact@v3
+            uses: actions/upload-artifact@v4
             if: ${{inputs.upload_artifacts}}
             with:
               name: mqtt_bin_${{inputs.target}}_${{ inputs.idf_version }}_${{ inputs.app_name }}