chore(deps): secure build-time Log4j (#781)

Author: jbeckwith-oai

openai-java-proguard-test/build.gradle.kts

@@ -16,6 +16,12 @@ buildscript {
             classpath("org.codehaus.plexus:plexus-utils:4.0.3") {
                 because("4.0.3 fixes CVE-2025-67030 in Shadow's build-time dependency")
             }
+            classpath("org.apache.logging.log4j:log4j-api:2.25.5") {
+                because("avoid vulnerable Log4j versions on the build classpath")
+            }
+            classpath("org.apache.logging.log4j:log4j-core:2.25.5") {
+                because("avoid vulnerable Log4j versions on the build classpath")
+            }
         }
     }
 }