[rust] Fix model constructor for required enum array (#14196)

For a required enum array property the generated model constructor used
the type `RequiredEnums` instead of `Vec<RequiredEnums>`.

modules/openapi-generator/src/main/resources/rust/model.mustache

@@ -79,7 +79,7 @@ impl {{{classname}}} {
     {{#description}}
     /// {{{.}}}
     {{/description}}
-    pub fn new({{#requiredVars}}{{{name}}}: {{#isNullable}}Option<{{/isNullable}}{{#isEnum}}{{{enumName}}}{{/isEnum}}{{^isEnum}}{{{dataType}}}{{/isEnum}}{{#isNullable}}>{{/isNullable}}{{^-last}}, {{/-last}}{{/requiredVars}}) -> {{{classname}}} {
+    pub fn new({{#requiredVars}}{{{name}}}: {{#isNullable}}Option<{{/isNullable}}{{#isEnum}}{{#isArray}}Vec<{{/isArray}}{{{enumName}}}{{#isArray}}>{{/isArray}}{{/isEnum}}{{^isEnum}}{{{dataType}}}{{/isEnum}}{{#isNullable}}>{{/isNullable}}{{^-last}}, {{/-last}}{{/requiredVars}}) -> {{{classname}}} {
         {{{classname}}} {
             {{#vars}}
             {{{name}}}{{^required}}{{#isArray}}: None{{/isArray}}{{#isMap}}: None{{/isMap}}{{^isContainer}}: None{{/isContainer}}{{/required}}{{#required}}{{#isModel}}: {{^isNullable}}Box::new({{{name}}}){{/isNullable}}{{#isNullable}}if let Some(x) = {{{name}}} {Some(Box::new(x))} else {None}{{/isNullable}}{{/isModel}}{{/required}},

modules/openapi-generator/src/test/resources/3_0/rust/petstore.yaml

@@ -877,4 +877,15 @@ components:
           nullable: true
         required_nullable:
           type: string
-          nullable: true
+          nullable: true
+    EnumArrayTesting:
+      description: Test of enum array
+      type: object
+      required:
+        - required_enums
+      properties:
+        required_enums:
+          type: array
+          items:
+            type: string
+            enum: ["A", "B", "C"]