chore: regen readme (#145)

autosynth cannot find the source of changes triggered by earlier changes in this
        repository, or by version upgrades to tools such as linters.

README.md

@@ -68,6 +68,16 @@ use this Cloud BigQuery Connection Client Library.
 
 
 
+## Samples
+
+Samples are in the [`samples/`](https://github.com/googleapis/java-bigqueryconnection/tree/master/samples) directory. The samples' `README.md`
+has instructions for running the samples.
+
+| Sample                      | Source Code                       | Try it |
+| --------------------------- | --------------------------------- | ------ |
+| Quickstart Sample | [source code](https://github.com/googleapis/java-bigqueryconnection/blob/master/samples/snippets/src/main/java/com/example/bigqueryconnection/QuickstartSample.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-bigqueryconnection&page=editor&open_in_editor=samples/snippets/src/main/java/com/example/bigqueryconnection/QuickstartSample.java) |
+
+
 
 ## Troubleshooting
 

synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-bigqueryconnection.git",
-        "sha": "0edf9b71b80492fe29440f01a71d3f80780a3809"
+        "sha": "78bf38bccc58765dc2dc4efb7864d07218bbd783"
       }
     },
     {