ci: build_changed_aports: Skip packages in 'archived' category

Per definition, those might not be buildable anymore, so stop trying to
validate building them.

Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/7480>

.ci/lib/build_changed_aports.py

@@ -36,7 +36,7 @@ if __name__ == "__main__":
     arch = sys.argv[1]
 
     # Get and print modified packages
-    packages = common.get_changed_packages()
+    packages = common.get_changed_packages(skip_archived=True)
 
     # Load context
     sys.argv = ["pmbootstrap.py", "chroot"]