Bump com.google.auth:google-auth-library-oauth2-http (#119)

Bumps com.google.auth:google-auth-library-oauth2-http from 1.19.0 to 1.20.0.

---
updated-dependencies:
- dependency-name: com.google.auth:google-auth-library-oauth2-http
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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pom.xml

@@ -79,7 +79,7 @@
     <dependency>
       <groupId>com.google.auth</groupId>
       <artifactId>google-auth-library-oauth2-http</artifactId>
-      <version>1.19.0</version>
+      <version>1.20.0</version>
     </dependency>
     <dependency>
       <groupId>com.google.oauth-client</groupId>