Update dependency kramdown to '~> 2.5.0' (jenkins-infra#7713)

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

Gemfile

@@ -13,7 +13,7 @@ gem 'rouge'
 # Support for various template engines we use
 gem 'haml', '~> 5.2.0'
 gem 'liquid', '~> 5.5.0'
-gem 'kramdown', '~> 2.4.0'
+gem 'kramdown', '~> 2.5.0'
 
 # Gems necessary for running scripts/fetch-external-resources
 group :fetcher do

Gemfile.lock

@@ -66,8 +66,8 @@ GEM
     http-cookie (1.0.5)
       domain_name (~> 0.5)
     http_parser.rb (0.8.0)
-    kramdown (2.4.0)
-      rexml
+    kramdown (2.5.1)
+      rexml (>= 3.3.9)
     liquid (5.5.1)
     listen (3.8.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
@@ -140,7 +140,7 @@ DEPENDENCIES
   faraday (~> 2.9.0)
   faraday-follow_redirects (~> 0.3.0)
   haml (~> 5.2.0)
-  kramdown (~> 2.4.0)
+  kramdown (~> 2.5.0)
   liquid (~> 5.5.0)
   naturally (~> 2.2.1)
   rouge