Adding the version catalog file to the update file regex (#7138)

Reported in #7105, we aren't closing PRs when they involve the version catalog file. We use this list of regex to compare against changes in push events to determine if we should close a PR.

gradle/lib/dependabot/gradle/file_updater.rb

@@ -13,7 +13,7 @@ class FileUpdater < Dependabot::FileUpdaters::Base
       SUPPORTED_BUILD_FILE_NAMES = %w(build.gradle build.gradle.kts).freeze
 
       def self.updated_files_regex
-        [/^build\.gradle(\.kts)?$/, %r{/build\.gradle(\.kts)?$}]
+        [/^build\.gradle(\.kts)?$/, %r{/build\.gradle(\.kts)?$}, %r{/gradle/libs\.versions\.toml$}]
       end
 
       def updated_dependency_files