chore: Downgrade circe-yaml to 0.15.1

Author: rlemaitre

project/Dependencies.scala

@@ -26,7 +26,7 @@ object Dependencies {
       "io.circe" %% "circe-core"    % "0.14.10",
       "io.circe" %% "circe-generic" % "0.14.10",
       "io.circe" %% "circe-parser"  % "0.14.10",
-      "io.circe" %% "circe-yaml"    % "0.16.0"
+      "io.circe" %% "circe-yaml"    % "0.15.1"
     )
 
     val http4s: Seq[ModuleID] = Seq(