Upgrade in-tree job to Ubuntu 22.04 (#2658)

The spirv-tools package used by the job seems no longer available for
Ubuntu 20.04.

Original commit:
KhronosGroup/SPIRV-LLVM-Translator@88e546a689b2679

Author: svenvh

llvm-spirv/.github/workflows/check-in-tree-build.yml

@@ -45,14 +45,14 @@ jobs:
           - build_type: Release
             shared_libs: EnableSharedLibs
       fail-fast: false
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     steps:
       - name: Install dependencies
         run: |
           curl -L "https://apt.llvm.org/llvm-snapshot.gpg.key" | sudo apt-key add -
           curl -L "https://packages.lunarg.com/lunarg-signing-key-pub.asc" | sudo apt-key add -
-          echo "deb https://apt.llvm.org/focal/ llvm-toolchain-focal main" | sudo tee -a /etc/apt/sources.list
-          echo "deb https://packages.lunarg.com/vulkan focal main" | sudo tee -a /etc/apt/sources.list
+          echo "deb https://apt.llvm.org/jammy/ llvm-toolchain-jammy main" | sudo tee -a /etc/apt/sources.list
+          echo "deb https://packages.lunarg.com/vulkan jammy main" | sudo tee -a /etc/apt/sources.list
           sudo apt-get update
           sudo apt-get -yq --no-install-suggests --no-install-recommends install \
             clang-${{ env.LLVM_VERSION }} \