DEV: Upgradae to Bundler 2.

DEV: Upgradae to Bundler 2.

diff --git a/Gemfile.lock b/Gemfile.lock
index 13faf68..283b5cc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -572,4 +572,4 @@ DEPENDENCIES
   webpush
 
 BUNDLED WITH
-   1.17.3
+   2.0.1

GitHub sha: f65c8a7b

Revert "DEV: Upgradae to Bundler 2."