build(deps): bump io.vertx:vertx-grpc from 4.5.5 to 4.5.6

Bumps io.vertx:vertx-grpc from 4.5.5 to 4.5.6.

---
updated-dependencies:
- dependency-name: io.vertx:vertx-grpc
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

gradle/libs.versions.toml

@@ -14,7 +14,7 @@ commonsIo = "2.15.1"
 commonCompress = "1.26.1"
 autoService = "1.1.1"
 errorprone = "2.26.1"
-vertx = "4.5.5"
+vertx = "4.5.6"
 picocli = "4.7.5"
 restAssured = "5.4.0"
 javaxAnnotation = "1.3.2"