Actions: Remove gcc 13 workaround; fixed by GitHub

.github/workflows/build-libfp-linux.yml

@@ -68,13 +68,6 @@ jobs:
         credentials: ${{ secrets.qt_ffynnon_cred }}
     - name: Update package index
       run: sudo apt-get update
-    - name: WORKAROUND FOR https://github.com/actions/runner-images/issues/8659
-      if: matrix.os == 'ubuntu-22.04'
-      run: |
-        echo "TEMPORARY WORKAROUND FOR GITHUB RUNNER BUG #8659\n\nRemoving GCC 13 as it breaks Clang14"
-        sudo rm -f /etc/apt/sources.list.d/ubuntu-toolchain-r-ubuntu-test-jammy.list
-        sudo apt-get update
-        sudo apt-get install -y --allow-downgrades libc6=2.35-0ubuntu3.4 libc6-dev=2.35-0ubuntu3.4 libstdc++6=12.3.0-1ubuntu1~22.04 libgcc-s1=12.3.0-1ubuntu1~22.04
     - name: Install OpenGL lib
       run: sudo apt-get install libglu1-mesa-dev
     - name: Install XCB-XKB