deps: update dependency com.google.cloud:google-cloud-core to v2.5.9 (#827)

* deps: update dependency com.google.cloud:google-cloud-core to v2.5.9

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errorreporting/install-without-bom/pom.xml

@@ -36,7 +36,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-core</artifactId>
-      <version>2.5.8</version>
+      <version>2.5.9</version>
     </dependency>
     <dependency>
       <groupId>junit</groupId>

errorreporting/snapshot/pom.xml

@@ -35,7 +35,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-core</artifactId>
-      <version>2.5.8</version>
+      <version>2.5.9</version>
     </dependency>
     <dependency>
       <groupId>junit</groupId>