Bump bootsnap from 1.4.6 to 1.4.7

Bumps [bootsnap](https://github.com/Shopify/bootsnap) from 1.4.6 to 1.4.7.
- [Release notes](https://github.com/Shopify/bootsnap/releases)
- [Changelog](https://github.com/Shopify/bootsnap/blob/master/CHANGELOG.md)
- [Commits](Shopify/bootsnap@v1.4.6...v1.4.7)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Gemfile.lock

@@ -64,7 +64,7 @@ GEM
       rack (>= 0.9.0)
     binding_of_caller (0.8.0)
       debug_inspector (>= 0.0.1)
-    bootsnap (1.4.6)
+    bootsnap (1.4.7)
       msgpack (~> 1.0)
     bootstrap-sass (3.4.1)
       autoprefixer-rails (>= 5.2.1)