chore(deps): update dependency com.google.cloud:google-cloud-billing …

…to v2.1.8 (#622)

* chore(deps): update dependency com.google.cloud:google-cloud-billing to v2.1.8

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

README.md

@@ -19,20 +19,20 @@ If you are using Maven, add this to your pom.xml file:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-billing</artifactId>
-  <version>2.1.7</version>
+  <version>2.1.8</version>
 </dependency>
 ```
 
 If you are using Gradle without BOM, add this to your dependencies
 
 ```Groovy
-implementation 'com.google.cloud:google-cloud-billing:2.1.7'
+implementation 'com.google.cloud:google-cloud-billing:2.1.8'
 ```
 
 If you are using SBT, add this to your dependencies
 
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-billing" % "2.1.7"
+libraryDependencies += "com.google.cloud" % "google-cloud-billing" % "2.1.8"
 ```
 
 ## Authentication

samples/install-without-bom/pom.xml

@@ -29,7 +29,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-billing</artifactId>
-      <version>2.1.7</version>
+      <version>2.1.8</version>
     </dependency>
     <!-- [END billing_install_without_bom] -->
 

samples/snapshot/pom.xml

@@ -28,7 +28,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-billing</artifactId>
-      <version>2.1.7</version>
+      <version>2.1.8</version>
     </dependency>
 
     <dependency>