Bump sprockets from 4.2.0 to 4.2.1 (primer#2317)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -57,7 +57,7 @@ GEM
       regexp_parser (>= 1.5, < 3.0)
       xpath (~> 3.2)
     coderay (1.1.3)
-    concurrent-ruby (1.2.0)
+    concurrent-ruby (1.2.2)
     crack (0.4.5)
       rexml
     crass (1.0.6)
@@ -200,7 +200,7 @@ GEM
     simplecov_json_formatter (0.1.4)
     smart_properties (1.17.0)
     sourcemap (0.1.1)
-    sprockets (4.2.0)
+    sprockets (4.2.1)
       concurrent-ruby (~> 1.0)
       rack (>= 2.2.4, < 4)
     sprockets-rails (3.4.2)