chore(deps): update dependency com.google.auth:google-auth-library-oauth2-http to v1.20.0 (#1295)

Co-authored-by: Lawrence Qiu <lawrenceqiu@google.com>

Author: renovate-bot

google-auth-library-java/samples/snippets/pom.xml

@@ -43,7 +43,7 @@
     <dependency>
       <groupId>com.google.auth</groupId>
       <artifactId>google-auth-library-oauth2-http</artifactId>
-      <version>1.19.0</version>
+      <version>1.20.0</version>
     </dependency>
 
 <!--    IAM dependency-->