Update version in pom.xml

Author: nbayati

cab-token-generator/pom.xml

@@ -6,7 +6,7 @@
   <parent>
     <groupId>com.google.auth</groupId>
     <artifactId>google-auth-library-parent</artifactId>
-    <version>1.31.0
+    <version>1.31.1-SNAPSHOT
     </version><!-- {x-version-update:google-auth-library-parent:current} -->
   </parent>