.ci/build-wheels.sh: Fix broken sourceforge URL to lame

Both GitHub Actions jobs `linux_wheels` are failing because of a broken sourceforge URL to lame.  Fixing that URL allows these two GitHub Actions jobs to pass.

Author: cclauss

.ci/build-wheels.sh

@@ -57,7 +57,7 @@ make install;
 make distclean;
 
 cd ~/ffmpeg_sources;
-curl -kLO "https://cfhcable.dl.sourceforge.net/project/lame/lame/$LAME_VERSION/lame-$LAME_VERSION.tar.gz"
+curl -kLO "https://downloads.sourceforge.net/project/lame/lame/$LAME_VERSION/lame-$LAME_VERSION.tar.gz"
 tar xzf "lame-$LAME_VERSION.tar.gz"
 cd "lame-$LAME_VERSION"
 ./configure --prefix="$BUILD_DIR" --enable-nasm --enable-shared;

.ci/build_wheels_osx.sh

@@ -127,7 +127,7 @@ if [ "$ARCH" = "x86_64" ]; then
   arg=("--enable-nasm")
 fi
 cd "$SRC_PATH";
-curl -kLO "https://cfhcable.dl.sourceforge.net/project/lame/lame/$LAME_VERSION/lame-$LAME_VERSION.tar.gz"
+curl -kLO "https://downloads.sourceforge.net/project/lame/lame/$LAME_VERSION/lame-$LAME_VERSION.tar.gz"
 tar xzf "lame-$LAME_VERSION.tar.gz"
 cd "lame-$LAME_VERSION"
 git apply "$base_dir/.ci/libmp3lame-symbols.patch"

.github/workflows/pythonapp.yml

@@ -170,10 +170,10 @@ jobs:
     needs: linux_wheels
     steps:
       - uses: actions/checkout@v4.2.2
-      - name: Set up Python 3.x
+      - name: Set up Python 3.13
         uses: actions/setup-python@v5.4.0
         with:
-          python-version: 3.x
+          python-version: 3.13  # 3.14 fails!
       - uses: actions/download-artifact@v4.2.1
         with:
           pattern: py_wheel-*