deps: update dependency org.threeten:threetenbp to v1.6.8 (#1590)

Co-authored-by: Joe Wang <[email protected]>

Author: renovate-bot

gax-java/dependencies.properties

@@ -64,7 +64,7 @@ maven.com_google_j2objc_j2objc_annotations=com.google.j2objc:j2objc-annotations:
 maven.com_google_auto_value_auto_value=com.google.auto.value:auto-value:1.10.1
 maven.com_google_auto_value_auto_value_annotations=com.google.auto.value:auto-value-annotations:1.10.1
 maven.com_google_api_api_common=com.google.api:api-common:2.7.0
-maven.org_threeten_threetenbp=org.threeten:threetenbp:1.6.7
+maven.org_threeten_threetenbp=org.threeten:threetenbp:1.6.8
 maven.com_google_api_grpc_grpc_google_iam_v1=com.google.api.grpc:grpc-google-iam-v1:1.10.0
 maven.com_google_api_grpc_proto_google_iam_v1=com.google.api.grpc:proto-google-iam-v1:1.10.0
 maven.com_google_http_client_google_http_client=com.google.http-client:google-http-client:1.43.1

gax-java/pom.xml

@@ -63,7 +63,7 @@
       <dependency>
         <groupId>org.threeten</groupId>
         <artifactId>threetenbp</artifactId>
-        <version>1.6.7</version>
+        <version>1.6.8</version>
       </dependency>
       <dependency>
         <groupId>com.google.code.findbugs</groupId>