Upgrade docker image & clang-format

• Docker image updated to Ubuntu 22.04LTS
• Clang-format is now clang-format-14 (the default version from Ubuntu 22.04). With this new version, lambdas are sometimes badly indented => this has been fixed.

heat/src/heat.h

@@ -54,4 +54,4 @@ class HeatTerm;
 class DisplayHook;
 }; // namespace heat
 
-#endif //HEAT_H
+#endif // HEAT_H