revert the bundler version

revert the bundler version

871fcf1117bf7f5dd91a590da517dd2949eca888

diff --git a/Gemfile.lock b/Gemfile.lock
index 973ec58..db8907d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -533,4 +533,4 @@ DEPENDENCIES
   webpush
 
 BUNDLED WITH
-   2.0.1
+   1.17.3

GitHub sha: 787ccb57