ci: use ffmpeg 8 for macOS

Author: nto

.github/workflows/test-suite.yaml

@@ -141,7 +141,7 @@ jobs:
           rm -f /usr/local/bin/idle3*
           rm -f /usr/local/bin/pydoc3*
           rm -f /usr/local/bin/python3*
-          brew install autoconf automake libtool pkg-config nasm ffmpeg@7 \
+          brew install autoconf automake libtool pkg-config nasm ffmpeg \
             freetype libebur128 libev libgcrypt libtasn1 speex x264 x265 luajit
           BREW_PREFIX="$(brew --prefix)"
           set-env HOST_CC "clang"
@@ -154,7 +154,6 @@ jobs:
           set-env DISABLE_VALGRIND "1"
           set-env INSERT_LIBRARIES "$(clang -print-search-dirs | sed -n 's/^libraries: =//p')/lib/darwin/libclang_rt.asan_osx_dynamic.dylib"
           set-env UBSAN_OPTIONS "print_stacktrace=1"
-          set-env PKG_CONFIG_PATH "$BREW_PREFIX/opt/ffmpeg@7/lib/pkgconfig"
 
       - name: Install bitstream
         run: |