ci: add Quarto version 1.8 to devcontainer configuration matrix build

Author: mcanouil

.github/workflows/devcontainer.yml

@@ -118,6 +118,7 @@ jobs:
           - "1.5"
           - "1.6"
           - "1.7"
+          - "1.8"
         include:
           - QUARTO_VERSION: "1.0"
             PLATFORM: "linux/amd64"