Gemfile: Upgrade Nokogiri to 1.13.10 (#46)

This fixes
https://github.com/perlun/perlun.eu.org/security/dependabot/14, dealing
with CVE-2022-23476

Gemfile

@@ -10,4 +10,4 @@ gem 'redcarpet', '~> 3.6'
 gem 'pygments.rb', '~> 1.1'
 
 # 1.14.0 is Ruby 2.7 only
-gem 'nokogiri', '< 1.14.0'
+gem 'nokogiri', '~> 1.13.10', '< 1.14.0'

Gemfile.lock

@@ -61,20 +61,20 @@ GEM
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.3.6)
-    mini_portile2 (2.8.0)
+    mini_portile2 (2.8.5)
     minitest (5.16.3)
     multi_json (1.13.1)
-    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)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (5.0.0)
     pygments.rb (1.2.1)
       multi_json (>= 1.0.0)
-    racc (1.6.0)
+    racc (1.7.3)
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
@@ -101,7 +101,7 @@ DEPENDENCIES
   jekyll-multiple-languages-plugin!
   jekyll-paginate (~> 1.1)
   jemoji (~> 0.13)
-  nokogiri (< 1.14.0)
+  nokogiri (~> 1.13.10, < 1.14.0)
   pygments.rb (~> 1.1)
   redcarpet (~> 3.6)