fix: typo in BOM dependency (#345)

The google-auth-library-appengine dependency is incorrectly named in the BOM.

Author: protocol7

google-auth-library-java/bom/pom.xml

@@ -61,7 +61,7 @@
       </dependency>
       <dependency>
         <groupId>com.google.auth</groupId>
-        <artifactId>google-auth-library-oauth2-appengine</artifactId>
+        <artifactId>google-auth-library-appengine</artifactId>
         <version>${project.version}</version>
       </dependency>
     </dependencies>