deps: update dependency org.checkerframework:checker-qual to v3.15.0 (#721)

Author: renovate-bot

pubsublite-beam-io/pom.xml

@@ -68,7 +68,7 @@
     <dependency>
       <groupId>org.checkerframework</groupId>
       <artifactId>checker-qual</artifactId>
-      <version>3.14.0</version>
+      <version>3.15.0</version>
     </dependency>
     <dependency>
       <groupId>com.google.guava</groupId>