feat: make author optional in getRecipes

libs/lexicons/lexicons/feed/getRecipes.tsp

···
   /** Response model for fetching multiple recipes. */
   @query
   op main(
-    @required author: atIdentifier,
+    author?: atIdentifier,
     @minValue(1) @maxValue(100) limit?: integer = 50,
     cursor?: string,
   ): {

libs/lexicons/lib/types/blue/recipes/feed/getRecipes.ts

···
 
 const _mainSchema = /*#__PURE__*/ v.query("blue.recipes.feed.getRecipes", {
   params: /*#__PURE__*/ v.object({
-    author: /*#__PURE__*/ v.actorIdentifierString(),
+    author: /*#__PURE__*/ v.optional(/*#__PURE__*/ v.actorIdentifierString()),
     cursor: /*#__PURE__*/ v.optional(/*#__PURE__*/ v.string()),
     /**
      * @minimum 1