Update dependency sprockets to v4

Author: renovate[bot]

src-api/Gemfile

@@ -9,6 +9,6 @@ gem 'middleman-sprockets', '~> 4.1'
 gem 'rouge', '~> 3.21'
 gem 'redcarpet', '~> 3.6.0'
 gem 'nokogiri', '~> 1.18.3'
-gem 'sprockets', '~> 3.7'
+gem 'sprockets', '~> 4.0'
 gem 'sass'
 gem 'webrick'

src-api/Gemfile.lock

@@ -11,12 +11,11 @@ GEM
     autoprefixer-rails (10.4.16.0)
       execjs (~> 2)
     backports (3.25.0)
-    base64 (0.2.0)
     coffee-script (2.4.1)
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    concurrent-ruby (1.3.4)
+    concurrent-ruby (1.3.5)
     contracts (0.16.1)
     dotenv (3.1.2)
     erubis (2.7.0)
@@ -95,7 +94,7 @@ GEM
     parslet (2.0.0)
     public_suffix (6.0.0)
     racc (1.8.1)
-    rack (2.2.9)
+    rack (2.2.11)
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)
@@ -110,10 +109,9 @@ GEM
     sassc (2.4.0)
       ffi (~> 1.9)
     servolux (0.13.0)
-    sprockets (3.7.5)
-      base64
+    sprockets (4.2.1)
       concurrent-ruby (~> 1.0)
-      rack (> 1, < 3)
+      rack (>= 2.2.4, < 4)
     temple (0.10.3)
     thor (1.2.2)
     tilt (2.0.11)
@@ -137,7 +135,7 @@ DEPENDENCIES
   redcarpet (~> 3.6.0)
   rouge (~> 3.21)
   sass
-  sprockets (~> 3.7)
+  sprockets (~> 4.0)
   webrick
 
 RUBY VERSION