Revert "Build: Fixed debian ports repo"

This reverts commit 0e25c5d282.

Signed-off-by: 吴小白 <296015668@qq.com>

.github/.ci/debian/Dockerfile

@@ -19,15 +19,6 @@ ARG DEPENDENCIES="         \
         python3-setuptools \
         xz-utils"
 
-RUN echo "deb http://snapshot.debian.org/archive/debian-ports/20250801T194242Z/ sid main"  > /etc/apt/sources.list && \
-    ( echo 'quiet "true";'; \
-      echo 'APT::Get::Assume-Yes "true";'; \
-      echo 'APT::Install-Recommends "false";'; \
-      echo 'Acquire::Check-Valid-Until "false";'; \
-      echo 'Acquire::Retries "5";'; \
-    ) > /etc/apt/apt.conf.d/99cpython-portable && \
-    rm -f /etc/apt/sources.list.d/*
-
 RUN --mount=type=cache,target=/var/cache/apt,sharing=locked \
     --mount=type=cache,target=/var/lib/apt,sharing=locked \
     apt-get update \