repology: exclude lxc from version checks

Last version confirmed to work is "3.1.0".

scripts/repology/excluded_packages.txt

@@ -64,6 +64,9 @@ aircrack-ng
 # listed version is for different project with same name
 rush
 
+# we need to ensure that package is working properly before applying updates
+lxc
+
 # Other packages for delisting from Repology to keep updates list clean.
 # This includes packages which are rarely updated or have versioning scheme unexpected
 # by Repology.