Update dependency org.junit:junit-bom to v5.9.3 (#881)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

build.gradle

@@ -185,7 +185,7 @@ allprojects { project ->
                 mavenBom "com.google.protobuf:protobuf-bom:${protobufVersion}"
                 mavenBom "com.google.guava:guava-bom:${guavaVersion}"
                 mavenBom "io.grpc:grpc-bom:${grpcVersion}"
-                mavenBom "org.junit:junit-bom:5.9.2"
+                mavenBom "org.junit:junit-bom:5.9.3"
                 mavenBom "org.jetbrains.kotlin:kotlin-bom:${kotlinVersion}"
             }
         }