chore: update ruby requirement (#1492)

Gemfile.lock

@@ -230,7 +230,7 @@ GEM
     listen (3.7.1)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
-    loofah (2.19.0)
+    loofah (2.19.1)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     mail (2.7.1)
@@ -259,10 +259,10 @@ GEM
       net-protocol
       timeout
     nio4r (2.5.8)
-    nokogiri (1.13.9)
+    nokogiri (1.13.10)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
-    nokogiri (1.13.9-x86_64-linux)
+    nokogiri (1.13.10-x86_64-linux)
       racc (~> 1.4)
     orm_adapter (0.5.0)
     pagy (5.10.1)
@@ -276,7 +276,7 @@ GEM
       nio4r (~> 2.0)
     pundit (2.2.0)
       activesupport (>= 3.0.0)
-    racc (1.6.0)
+    racc (1.6.1)
     rack (2.2.4)
     rack-test (2.0.2)
       rack (>= 1.3)
@@ -302,8 +302,8 @@ GEM
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
       nokogiri (>= 1.6)
-    rails-html-sanitizer (1.4.3)
-      loofah (~> 2.3)
+    rails-html-sanitizer (1.4.4)
+      loofah (~> 2.19, >= 2.19.1)
     rails-i18n (7.0.5)
       i18n (>= 0.7, < 2)
       railties (>= 6.0.0, < 8)

avo.gemspec

@@ -27,7 +27,7 @@ Gem::Specification.new do |spec|
       "public gem pushes."
   end
 
-  spec.required_ruby_version = ">= 2.4.0"
+  spec.required_ruby_version = ">= 2.6.0"
   spec.post_install_message = "Thank you for using Avo 💪  Docs are available at https://docs.avohq.io"
 
   spec.files = Dir["{bin,app,config,db,lib,public}/**/*", "MIT-LICENSE", "Rakefile", "README.md", "avo.gemspec", "Gemfile", "Gemfile.lock"]