Update to latest action versions

.github/workflows/build.yml

@@ -223,7 +223,7 @@ jobs:
           security import $CERTIFICATE_PATH -P "$P12_PASSWORD" -A -t cert -f pkcs12 -k $KEYCHAIN_PATH
           security list-keychain -d user -s $KEYCHAIN_PATH
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - name: Configure
@@ -265,7 +265,7 @@ jobs:
           GQRX_VERSION=$(<build/version.txt)
           mv Gqrx.dmg Gqrx-$GQRX_VERSION.dmg
       - name: Save artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: gqrx-macos-${{ github.run_id }}
           path: Gqrx-*.dmg

.github/workflows/ci.yml

@@ -50,7 +50,7 @@ jobs:
             libqt6svgwidgets6 \
             libgl-dev
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Configure
         run: |
           mkdir build
@@ -87,7 +87,7 @@ jobs:
           LIBRARY_PATH=/usr/local/opt/icu4c/lib make -j4
           make install
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Configure
         run: mkdir build && cd build && cmake -DOSX_AUDIO_BACKEND:STRING=${{ matrix.backend }} ..
       - name: Compile
@@ -151,7 +151,7 @@ jobs:
         cmake --build build
         cmake --install build
     - name: Checkout code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: Configure, compile & install
       run: |
         cmake -S . -B build \