remove the break-system-packages option to fix the build

Author: Dumeng

.github/scripts/build.sh

@@ -14,5 +14,5 @@ error() {
 cd cpython/Doc || exit 1
 mkdir -p locales/"$LOCALE"/
 ln -sfn "$(realpath ../../docs)" locales/"$LOCALE"/LC_MESSAGES
-pip3 install -q -r requirements.txt --break-system-packages
+pip3 install -q -r requirements.txt
 sphinx-build -b dummy -d build/doctrees  -j auto -D language=$LOCALE -D gettext_compact=0 -E --keep-going -W . build/html 2> >(error)