update feign to newer version (#17983)

Author: wing328

modules/openapi-generator/src/main/resources/Java/libraries/feign/pom.mustache

@@ -380,7 +380,7 @@
         {{#swagger2AnnotationLibrary}}
         <swagger-annotations-version>2.2.15</swagger-annotations-version>
         {{/swagger2AnnotationLibrary}}
-        <feign-version>12.5</feign-version>
+        <feign-version>13.2.1</feign-version>
         <feign-form-version>3.8.0</feign-form-version>
         {{#jackson}}
         <jackson-version>2.15.2</jackson-version>

samples/client/echo_api/java/feign-gson/pom.xml

@@ -300,7 +300,7 @@
         <java.version>1.8</java.version>
         <maven.compiler.source>${java.version}</maven.compiler.source>
         <maven.compiler.target>${java.version}</maven.compiler.target>
-        <feign-version>12.5</feign-version>
+        <feign-version>13.2.1</feign-version>
         <feign-form-version>3.8.0</feign-form-version>
         <gson-version>2.10.1</gson-version>
         <jackson-databind-nullable-version>0.2.6</jackson-databind-nullable-version>

samples/client/petstore/java/feign-no-nullable/pom.xml

@@ -311,7 +311,7 @@
         <java.version>1.8</java.version>
         <maven.compiler.source>${java.version}</maven.compiler.source>
         <maven.compiler.target>${java.version}</maven.compiler.target>
-        <feign-version>12.5</feign-version>
+        <feign-version>13.2.1</feign-version>
         <feign-form-version>3.8.0</feign-form-version>
         <jackson-version>2.15.2</jackson-version>
         <jackson-databind-version>2.15.2</jackson-databind-version>

samples/client/petstore/java/feign/pom.xml

@@ -316,7 +316,7 @@
         <java.version>1.8</java.version>
         <maven.compiler.source>${java.version}</maven.compiler.source>
         <maven.compiler.target>${java.version}</maven.compiler.target>
-        <feign-version>12.5</feign-version>
+        <feign-version>13.2.1</feign-version>
         <feign-form-version>3.8.0</feign-form-version>
         <jackson-version>2.15.2</jackson-version>
         <jackson-databind-nullable-version>0.2.6</jackson-databind-nullable-version>