Remove Intel oneAPI CI jobs

These started spontaneously failing due to some Debian package
repository key issues.

https://github.com/SFML/SFML/actions/runs/6365368228/job/17282319034#step:6:40

.github/workflows/ci.yml

@@ -28,7 +28,6 @@ jobs:
         - { name: Windows MinGW,          os: windows-2022, flags: -DSFML_USE_MESA3D=TRUE -DCMAKE_C_COMPILER=gcc -DCMAKE_CXX_COMPILER=g++ -GNinja }
         - { name: Linux GCC,            os: ubuntu-22.04, flags: -DSFML_RUN_DISPLAY_TESTS=ON -GNinja }
         - { name: Linux Clang,          os: ubuntu-22.04, flags: -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DSFML_RUN_DISPLAY_TESTS=ON -GNinja , gcovr_options: '--gcov-executable="llvm-cov-$CLANG_VERSION gcov"' }
-        - { name: Linux Intel oneAPI,   os: ubuntu-22.04, flags: -DCMAKE_C_COMPILER=icx -DCMAKE_CXX_COMPILER=icpx -GNinja }
         - { name: macOS,                os: macos-12, flags: -GNinja }
         - { name: macOS Xcode,          os: macos-12, flags: -GXcode }
         - { name: iOS,                  os: macos-12, flags: -DCMAKE_SYSTEM_NAME=iOS -DCMAKE_OSX_ARCHITECTURES=arm64 }
@@ -92,17 +91,6 @@ jobs:
         echo "CLANG_VERSION=$CLANG_VERSION" >> $GITHUB_ENV
         sudo apt-get install gcovr ${{ matrix.platform.name == 'Linux Clang' && 'llvm-$CLANG_VERSION' || '' }}
 
-    - name: Install Intel oneAPI
-      if: matrix.platform.name == 'Linux Intel oneAPI'
-      run: |
-        wget -O- https://apt.repos.intel.com/intel-gpg-keys/GPG-PUB-KEY-INTEL-SW-PRODUCTS.PUB \
-          | gpg --dearmor | sudo tee /usr/share/keyrings/oneapi-archive-keyring.gpg > /dev/null
-        echo "deb [signed-by=/usr/share/keyrings/oneapi-archive-keyring.gpg] https://apt.repos.intel.com/oneapi all main" | sudo tee /etc/apt/sources.list.d/oneAPI.list
-        sudo apt-get update
-        sudo apt-get install intel-oneapi-compiler-dpcpp-cpp
-        source /opt/intel/oneapi/setvars.sh
-        printenv >> $GITHUB_ENV
-
     - name: Install macOS Tools
       if: runner.os == 'macOS'
       run: |