Bump kramdown from 2.5.0 to 2.5.1 (#4074)

Bumps [kramdown](https://github.com/gettalong/kramdown) from 2.5.0 to
2.5.1.
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Gemfile.lock

@@ -223,8 +223,8 @@ GEM
       activerecord
       kaminari-core (= 1.2.2)
     kaminari-core (1.2.2)
-    kramdown (2.5.0)
-      rexml (>= 3.3.6)
+    kramdown (2.5.1)
+      rexml (>= 3.3.9)
     language_server-protocol (3.17.0.3)
     launchy (3.0.1)
       addressable (~> 2.8)