Improve wording of "topic: infrastructure" label description

The previous description of the "topic: infrastructure" repository label was:

> Related to repository infrastructure

This might give the impression that it is intended to be only for Git-related things (e.g., `.gitignore`), but actually
this is for anything related to the infrastructure of the project (e.g., build system, dependencies) which includes, but
is not limited to, Git-related things.

A more general description will more effectively communicate the intended meaning of the label.

Author: per1234

workflow-templates/assets/sync-labels/universal.yml

@@ -77,7 +77,7 @@
   description: Assistance from the community is especially welcome
 - name: "topic: infrastructure"
   color: "00ffff"
-  description: Related to repository infrastructure
+  description: Related to project infrastructure
   aliases:
     - dependencies
 - name: "topic: code"