deps: update dependency org.checkerframework:checker-qual to v3.21.1 (#…

…1015)

* deps: update dependency org.checkerframework:checker-qual to v3.21.1

* 🦉 Updates from OwlBot

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

pom.xml

@@ -69,7 +69,7 @@
         <!-- Explicit override, remove when no longer needed.-->
         <groupId>org.checkerframework</groupId>
         <artifactId>checker-qual</artifactId>
-        <version>3.21.0</version>
+        <version>3.21.1</version>
       </dependency>
       <dependency>
         <groupId>com.google.truth</groupId>