build: make Guava a compile dependency to fix CI failure

Author: meltsufin

release-note-generation/pom.xml

@@ -42,7 +42,6 @@
 			<groupId>com.google.guava</groupId>
 			<artifactId>guava</artifactId>
 			<version>32.1.3-jre</version>
-			<scope>test</scope>
 		</dependency>
 	</dependencies>
 

release-note-generation/src/test/java/com/google/cloud/ReleaseNoteGenerationTest.java

@@ -167,4 +167,5 @@ public void testFetchReleaseNote() throws Exception {
                 + " ([#1790](https://github.com/googleapis/java-storage/issues/1790)) "
                 + "([31c1b18](https://github.com/googleapis/java-storage/commit/31c1b18acc3c118e39eb613a82ee292f3e246b8f))");
   }
+
 }