Update dependency bootsnap to v1.21.1

Author: renovate[bot]

Gemfile.lock

@@ -110,7 +110,7 @@ GEM
     bindex (0.8.1)
     binding_of_caller (1.0.1)
       debug_inspector (>= 1.2.0)
-    bootsnap (1.20.1)
+    bootsnap (1.21.1)
       msgpack (~> 1.2)
     builder (3.3.0)
     cgi (0.5.1)