GH actions: Update Clang to 16 on Linux to fix build error

.github/workflows/cmake-multi-platform.yml

@@ -32,8 +32,8 @@ jobs:
             cpp_compiler: g++-13
           - os: ubuntu-latest
             toolchain: LLVM
-            c_compiler: clang-15
-            cpp_compiler: clang++-15
+            c_compiler: clang-16
+            cpp_compiler: clang++-16
           - os: windows-latest
             toolchain: MSVC
             c_compiler: cl
@@ -66,6 +66,15 @@ jobs:
         run: |
           echo "build-output-dir=${{ github.workspace }}/build" >> "$GITHUB_OUTPUT"
 
+      - name: Update Ubuntu images to Clang 16
+        # Workaround until https://github.com/actions/runner-images/issues/8659 is resolved
+        if: runner.os == 'Linux'
+        run: >
+          sudo cp tools/llvm-snapshot.gpg.key.asc /etc/apt/trusted.gpg.d/llvm-snapshot.asc
+          sudo add-apt-repository "deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-16 main"
+          sudo apt-get -qq update
+          sudo apt-get -qq install clang-16
+
       - name: Configure CMake (Unix)
         if: runner.os != 'Windows'
         # Configure CMake in a 'build' subdirectory. `CMAKE_BUILD_TYPE` is only required if you are using a single-configuration generator such as make.