chore: regenerate README versions (#272)

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Author: yoshi-automation

README.md

@@ -17,7 +17,7 @@ If you are using Maven with [BOM][libraries-bom], add this to your pom.xml file
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>libraries-bom</artifactId>
-      <version>7.0.1</version>
+      <version>8.0.0</version>
       <type>pom</type>
       <scope>import</scope>
     </dependency>

synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-pubsub.git",
-        "sha": "6b0947b0c142691a16190b7d15da136936517e5a"
+        "sha": "9684bc458b57951c4b7bfb13067dc8faac28902e"
       }
     },
     {