deps: update dependency com.google.cloud:google-cloud-core to v2.9.0 (#1435)

* deps: update dependency com.google.cloud:google-cloud-core to v2.9.0

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samples/install-without-bom/pom.xml

@@ -80,7 +80,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-core</artifactId>
-      <version>2.8.28</version>
+      <version>2.9.0</version>
       <classifier>tests</classifier>
     </dependency>
     <dependency>

samples/snapshot/pom.xml

@@ -79,7 +79,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-core</artifactId>
-      <version>2.8.28</version>
+      <version>2.9.0</version>
       <classifier>tests</classifier>
     </dependency>
     <dependency>

samples/snippets/pom.xml

@@ -94,7 +94,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-core</artifactId>
-      <version>2.8.28</version>
+      <version>2.9.0</version>
       <classifier>tests</classifier>
     </dependency>
     <!-- [END_EXCLUDE] -->