[create-pull-request] automated change (#312)

Co-authored-by: mre <175809+mre@users.noreply.github.com>

Author: github-actions[bot]

action.yml

@@ -27,7 +27,7 @@ inputs:
     required: false
   lycheeVersion:
     description: "Use custom version of lychee link checker"
-    default: v0.20.1
+    default: v0.21.0
     required: false
   output:
     description: "Summary output file path"