fix ubuntu being unable to fetch gcc

Author: Caznix

.github/workflows/ci.yml

@@ -67,7 +67,10 @@ jobs:
         if: runner.os == 'Linux'
         run: |
           sudo apt-get update
-          sudo apt-get install -y gcc-multilib gcc-aarch64-linux-gnu
+          sudo apt-get install -y software-properties-common
+          sudo add-apt-repository ppa:ubuntu-toolchain-r/test
+          sudo apt-get update
+          sudo apt-get install -y gcc-13 gcc-13-aarch64-linux-gnu
       - run: cargo build --release --target ${{ matrix.rust-target }}
       - name: Run Tests
         if: matrix.rust-target != 'aarch64-pc-windows-msvc'