Upgrade to Bootsnap 1.4.6

This upgrade makes it possible to pre-compute a Bootsnap cache for a
containerized system, since the `ruby_platform` header is no longer
dependent on `uname -v`--which changes depending on the host kernel--but
rather on the glibc version:
https://github.com/Shopify/bootsnap/pull/283

Full list of changes:
https://github.com/Shopify/bootsnap/compare/v1.4.5..v1.4.6

Gemfile

@@ -2,7 +2,7 @@ source 'https://rubygems.org'
 
 gem 'rails', '6.0.2'
 
-gem 'bootsnap', '~> 1.4'
+gem 'bootsnap', '~> 1.4.6'
 
 # Improves copy-on-write performance for MRI
 gem 'nakayoshi_fork', '~> 0.0.4'

Gemfile.lock

@@ -123,7 +123,7 @@ GEM
     binding_ninja (0.2.3)
     binding_of_caller (0.8.0)
       debug_inspector (>= 0.0.1)
-    bootsnap (1.4.5)
+    bootsnap (1.4.6)
       msgpack (~> 1.0)
     bootstrap_form (4.2.0)
       actionpack (>= 5.0)
@@ -1171,7 +1171,7 @@ DEPENDENCIES
   benchmark-memory (~> 0.1)
   better_errors (~> 2.5.0)
   binding_of_caller (~> 0.8.0)
-  bootsnap (~> 1.4)
+  bootsnap (~> 1.4.6)
   bootstrap_form (~> 4.2.0)
   brakeman (~> 4.2)
   browser (~> 2.5)

changelogs/unreleased/sh-upgrade-bootsnap-1-4-6.yml

+---
+title: Upgrade to Bootsnap 1.4.6
+merge_request: 25844
+author:
+type: performance