Upgrade okhttp to 4.12.0 for security fixes (#1226)

Author: seratch

pom.xml

@@ -49,7 +49,7 @@
         <javax.servlet-api.version>3.1.0</javax.servlet-api.version>
         <!-- We don't change the versions of servlet API interface to keep the backward compatibility with older versions of them -->
         <jakarta.servlet-api.version>5.0.0</jakarta.servlet-api.version>
-        <okhttp.version>4.11.0</okhttp.version>
+        <okhttp.version>4.12.0</okhttp.version>
         <gson.version>2.10.1</gson.version>
         <kotlin.version>1.9.10</kotlin.version>
         <!-- Note that we should not upgrade sfl4j-api to v2 to avoid confusions on the users side.