fix(crystal): bump to Crest 1.5.1

Author: n-rodriguez

modules/openapi-generator/src/main/resources/crystal/shard.mustache

@@ -8,7 +8,7 @@ crystal: ">= 0.35.1"
 dependencies:
   crest:
     github: mamantoha/crest
-    version: ~> 1.3.13
+    version: ~> 1.5.1
 
 development_dependencies:
   kemal: