Upgrade Feign to 12.3. Fixes gh-862.

Author: OlgaMaciaszek

spring-cloud-openfeign-dependencies/pom.xml

@@ -15,7 +15,7 @@
 	<name>spring-cloud-openfeign-dependencies</name>
 	<description>Spring Cloud OpenFeign Dependencies</description>
 	<properties>
-		<feign.version>12.1</feign.version>
+		<feign.version>12.3</feign.version>
 		<feign-form.version>3.8.0</feign-form.version>
 	</properties>
 	<dependencyManagement>