Add silkeh/clang:17-bookworm

Author: rwgk

.github/workflows/ci.yml

@@ -333,6 +333,9 @@ jobs:
           - clang: 16
             std: 20
             container_suffix: "-bullseye"
+          - clang: 17
+            std: 20
+            container_suffix: "-bookworm"
 
     name: "🐍 3 • Clang ${{ matrix.clang }} • C++${{ matrix.std }} • x64"
     container: "silkeh/clang:${{ matrix.clang }}${{ matrix.container_suffix }}"