Update dependency com.google.appengine:appengine-api-1.0-sdk to v2.0.31 (#169)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

maven-google-appengine-standard/pom.xml

@@ -13,7 +13,7 @@
     <properties>
         <kotlin.version>2.0.20</kotlin.version>
         <slf4j.version>1.7.36</slf4j.version>
-        <appengine.version>2.0.12</appengine.version>
+        <appengine.version>2.0.31</appengine.version>
         <servlet.version>4.0.1</servlet.version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>