Replace apt-fast with apt-get

`apt-fast` was removed from GitHub with Ubuntu 24.04:

- actions/runner-images#10003

For compatibility, switch back to `apt-get`.

.github/workflows/ci.yml

@@ -74,8 +74,8 @@ jobs:
         if: runner.os == 'Linux' && matrix.target.cpu == 'i386'
         run: |
           sudo dpkg --add-architecture i386
-          sudo apt-fast update -qq
-          sudo DEBIAN_FRONTEND='noninteractive' apt-fast install \
+          sudo apt-get update -qq
+          sudo DEBIAN_FRONTEND='noninteractive' apt-get install \
             --no-install-recommends -yq gcc-multilib g++-multilib \
             libssl-dev:i386
           mkdir -p external/bin
@@ -176,7 +176,7 @@ jobs:
         run: |
           # Add GCC-14 to alternatives
           sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-14 14
-      
+
           # Set GCC-14 as the default
           sudo update-alternatives --set gcc /usr/bin/gcc-14