chore: regenerate README (#509)

This PR was generated using Autosynth. 🌈


<details><summary>Log from Synthtool</summary>

```
2021-04-07 20:16:25,891 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-containeranalysis/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-04-07 20:16:27,155 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

```
</details>

Full log will be available here:
https://source.cloud.google.com/results/invocations/5830e4bd-2ca0-4ef1-af26-b75f4a5bfc13/targets

- [ ] To automatically regenerate this PR, check this box. (May take up to 24 hours.)

.github/readme/synth.metadata/synth.metadata

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-containeranalysis.git",
-        "sha": "5d2498401d442700bda96ee6411e59d4aeb76ccb"
+        "sha": "52cb67868bd4df0d5fc4073acdd58f61ca395e11"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "f4c3a57aeddad8ad720e075a9e8342f1f7b9b766"
+        "sha": "705743e66f5c0b24a95f7f30619c9d3ef747b317"
       }
     }
   ]

README.md

@@ -38,7 +38,7 @@ If you are using Maven without BOM, add this to your dependencies:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-containeranalysis</artifactId>
-  <version>1.2.33</version>
+  <version>1.2.34</version>
 </dependency>
 
 ```