Update dependency w3c_validators to '~> 1.3.7' (#52)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

bin/template/Gemfile

@@ -34,5 +34,5 @@ end
 
 group :test do
   # validation
-  gem 'w3c_validators', '~> 1.3.1'
+  gem 'w3c_validators', '~> 1.3.7'
 end

bin/template/Gemfile.lock

@@ -81,7 +81,7 @@ GEM
       concurrent-ruby (~> 1.1)
       sorted_set (~> 1.0)
     io-console (0.8.2)
-    json (2.19.2)
+    json (2.19.5)
     json_schema (0.21.0)
     katex (0.10.0)
       execjs (~> 2.8)
@@ -141,7 +141,7 @@ GEM
       nanoc-core (~> 4.11, >= 4.11.15)
     nenv (0.3.0)
     nio4r (2.7.5)
-    nokogiri (1.19.2-x86_64-linux-gnu)
+    nokogiri (1.19.3-x86_64-linux-gnu)
       racc (~> 1.4)
     notiffany (0.1.3)
       nenv (~> 0.1)
@@ -245,7 +245,7 @@ DEPENDENCIES
   sass
   scholarmarkdown
   unicode_utils
-  w3c_validators (~> 1.3.1)
+  w3c_validators (~> 1.3.7)
 
 BUNDLED WITH
   4.0.7