Run examples compilation CI workflow on changes to library.properties

The library.properties metadata file can have an impact on compilation, so the CI workflow should run when it's changed
in order to assist in validation of those changes.

Author: per1234

.github/workflows/compile-examples.yml

@@ -4,11 +4,13 @@ on:
   pull_request:
     paths:
       - ".github/workflows/compile-examples.yml"
+      - "library.properties"
       - "examples/**"
       - "src/**"
   push:
     paths:
       - ".github/workflows/compile-examples.yml"
+      - "library.properties"
       - "examples/**"
       - "src/**"
   # Scheduled trigger checks for breakage caused by changes to external resources (libraries, platforms)