feat: re-generated to pick up changes in the API or client library generator. (#105)

* Change triggered by none of the following:
This git repo (https://github.com/googleapis/java-bigquerydatatransfer.git)
Git repo https://github.com/googleapis/googleapis.git
Git repo https://github.com/googleapis/synthtool.git

* Add a new AuthorizationType for Data Source Definition.

googleapis/googleapis@17cfae0
commit 17cfae00f2bb51cb1683f017da7e295a1b0f01a8
Author: Google APIs <noreply@google.com>
Date:   Tue Mar 31 10:21:11 2020 -0700

    Add a new AuthorizationType for Data Source Definition.

    PiperOrigin-RevId: 303992863

Author: yoshi-automation

README.md

@@ -20,7 +20,7 @@ If you are using Maven with [BOM][libraries-bom], add this to your pom.xml file
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>libraries-bom</artifactId>
-      <version>4.3.0</version>
+      <version>4.4.0</version>
       <type>pom</type>
       <scope>import</scope>
     </dependency>

proto-google-cloud-bigquerydatatransfer-v1/src/main/java/com/google/cloud/bigquery/datatransfer/v1/DataSource.java

@@ -299,6 +299,18 @@ public enum AuthorizationType implements com.google.protobuf.ProtocolMessageEnum
      * <code>GOOGLE_PLUS_AUTHORIZATION_CODE = 2;</code>
      */
     GOOGLE_PLUS_AUTHORIZATION_CODE(2),
+    /**
+     *
+     *
+     * <pre>
+     * Use First Party Client OAuth. First Party Client OAuth doesn't require a
+     * refresh token to get an offline access token. Instead, it uses a
+     * client-signed JWT assertion to retrieve an access token.
+     * </pre>
+     *
+     * <code>FIRST_PARTY_OAUTH = 3;</code>
+     */
+    FIRST_PARTY_OAUTH(3),
     UNRECOGNIZED(-1),
     ;
 
@@ -334,6 +346,18 @@ public enum AuthorizationType implements com.google.protobuf.ProtocolMessageEnum
      * <code>GOOGLE_PLUS_AUTHORIZATION_CODE = 2;</code>
      */
     public static final int GOOGLE_PLUS_AUTHORIZATION_CODE_VALUE = 2;
+    /**
+     *
+     *
+     * <pre>
+     * Use First Party Client OAuth. First Party Client OAuth doesn't require a
+     * refresh token to get an offline access token. Instead, it uses a
+     * client-signed JWT assertion to retrieve an access token.
+     * </pre>
+     *
+     * <code>FIRST_PARTY_OAUTH = 3;</code>
+     */
+    public static final int FIRST_PARTY_OAUTH_VALUE = 3;
 
     public final int getNumber() {
       if (this == UNRECOGNIZED) {
@@ -365,6 +389,8 @@ public static AuthorizationType forNumber(int value) {
           return AUTHORIZATION_CODE;
         case 2:
           return GOOGLE_PLUS_AUTHORIZATION_CODE;
+        case 3:
+          return FIRST_PARTY_OAUTH;
         default:
           return null;
       }