upgrade ruby version (#18)

.ruby-version

@@ -1 +1 @@
-2.4.4
+3.2.2

Gemfile

@@ -1,12 +1,12 @@
 source "https://rubygems.org"
 
-ruby "2.4.4"
+ruby "3.2.2"
 
-gem "sinatra", "~>2.2.3"
+gem "sinatra"
 gem "sinatra-contrib"
 gem "erubis"
-gem "rack", ">= 1.6.12"
-gem "rack-protection", ">= 1.5.5"
+gem "rack"
+gem "rack-protection"
 gem "rack-test"
 gem "minitest"
 

Gemfile.lock

@@ -2,31 +2,31 @@ GEM
   remote: https://rubygems.org/
   specs:
     erubis (2.7.0)
-    minitest (5.14.0)
-    multi_json (1.14.1)
-    mustermann (2.0.2)
+    minitest (5.18.1)
+    multi_json (1.15.0)
+    mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
-    nio4r (2.5.8)
-    puma (4.3.12)
+    nio4r (2.5.9)
+    puma (6.3.0)
       nio4r (~> 2.0)
-    rack (2.2.6.4)
-    rack-protection (2.2.3)
+    rack (2.2.7)
+    rack-protection (3.0.6)
       rack
-    rack-test (1.1.0)
-      rack (>= 1.0, < 3)
+    rack-test (2.1.0)
+      rack (>= 1.3)
     ruby2_keywords (0.0.5)
-    sinatra (2.2.3)
-      mustermann (~> 2.0)
-      rack (~> 2.2)
-      rack-protection (= 2.2.3)
+    sinatra (3.0.6)
+      mustermann (~> 3.0)
+      rack (~> 2.2, >= 2.2.4)
+      rack-protection (= 3.0.6)
       tilt (~> 2.0)
-    sinatra-contrib (2.2.3)
+    sinatra-contrib (3.0.6)
       multi_json
-      mustermann (~> 2.0)
-      rack-protection (= 2.2.3)
-      sinatra (= 2.2.3)
+      mustermann (~> 3.0)
+      rack-protection (= 3.0.6)
+      sinatra (= 3.0.6)
       tilt (~> 2.0)
-    tilt (2.1.0)
+    tilt (2.2.0)
 
 PLATFORMS
   ruby
@@ -35,14 +35,14 @@ DEPENDENCIES
   erubis
   minitest
   puma
-  rack (>= 1.6.12)
-  rack-protection (>= 1.5.5)
+  rack
+  rack-protection
   rack-test
-  sinatra (~> 2.2.3)
+  sinatra
   sinatra-contrib
 
 RUBY VERSION
-   ruby 2.4.4p296
+   ruby 3.2.2p53
 
 BUNDLED WITH
-   2.1.4
+   2.4.10