Upgrade Travis Ubuntu version

.travis.yml

@@ -6,6 +6,7 @@
 
 language: cpp
 sudo: false
+dist: jammy
 compiler:
   - clang
 
@@ -16,21 +17,14 @@ cache:
 
 addons:
   apt:
-    sources:
-      - ubuntu-toolchain-r-test
     packages:
       # Build dependencies:
       - cmake
       - p7zip-full
 
-before_install:
-  # This workaround is required to avoid libstdc++ errors (Emscripten requires a recent version of libstdc++)
-  - wget -q -O libstdc++6 http://security.ubuntu.com/ubuntu/pool/main/g/gcc-5/libstdc++6_5.4.0-6ubuntu1~16.04.12_amd64.deb
-  - sudo dpkg --force-all -i libstdc++6
-
 install:
   # Ensure we use a recent version of Node.js (and npm).
-  - nvm install v16 && nvm use v16
+  - nvm install v18 && nvm use v18
   #Compile the tests only for GDCore
   - mkdir .build-tests
   - cd .build-tests