chore: regenerate README versions (#165)

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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>5.5.0</version>
+      <version>5.7.0</version>
       <type>pom</type>
       <scope>import</scope>
     </dependency>

synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-tasks.git",
-        "sha": "ec27f5afba3fa4f4268273e95c2fb0b05d815905"
+        "sha": "ce74f9155862248e61cc1d77f771562902fc0f55"
       }
     },
     {