Add support for dependencies preparation to general:cache-dep-licenses task

The `general:cache-dep-licenses` task is used to generate metadata about the licenses of the project's dependencies.

When using some dependency management systems, it is necessary to run an operation via the dependency management tool
prior to generating the metadata. Since this task is a standardized "asset" which is intended to be usable with any
project, a call to a `general:prepare-deps` task was added to the `general:cache-dep-licenses` task in order to allow it
to be used with such project types.

The operation required by the specific dependencies management system in use is performed in the `general:prepare-deps`
task. It happens that such a preparatory operation is not necessary with the Go modules dependency management system, so
an empty task is provided for use in Go module-based projects.

Since this project is Go module-based, the change is not essential. However, it is best to keep the asset in sync with
the upstream copy to facilitate maintenance of the project infrastructure.

Author: per1234

Taskfile.yml

@@ -95,6 +95,8 @@ tasks:
   # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/check-dependencies-task/Taskfile.yml
   general:cache-dep-licenses:
     desc: Cache dependency license metadata
+    deps:
+      - task: general:prepare-deps
     cmds:
       - |
         if ! which licensed &>/dev/null; then
@@ -142,6 +144,11 @@ tasks:
           codespell \
             --write-changes
 
+  # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/check-go-dependencies-task/Taskfile.yml
+  general:prepare-deps:
+    desc: Prepare project dependencies for license check
+    # No preparation is needed for Go module-based projects.
+
   # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/check-go-task/Taskfile.yml
   go:fix:
     desc: Modernize usages of outdated APIs