Add missing tasks to "umbrella" tasks

The Taskfile contains convenience tasks that allow the contributor to run all tasks of a given type with a single
command:

- check: run all tasks that check for problems with the project
- fix: run all tasks that automatically fix problems with the project

Some task that were added to the file were appropriate for inclusion in these "umbrella" tasks, but were not added.

Author: per1234

Taskfile.yml

@@ -11,11 +11,14 @@ tasks:
     deps:
       - task: npm:validate
       - task: general:check-spelling
+      - task: npm:validate
+      - task: poetry:validate
 
   fix:
     desc: Make automated corrections to the project's files
     deps:
       - task: general:correct-spelling
+      - task: poetry:sync
 
   # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/spell-check-task/Taskfile.yml
   general:check-spelling: