Bumps `vertx.version` from 5.0.4 to 5.0.8.

Updates `io.vertx:vertx-core` from 5.0.4 to 5.0.8
- [Commits](eclipse-vertx/vert.x@5.0.4...5.0.8)

Updates `io.vertx:vertx-web-client` from 4.5.14 to 5.0.8
- [Commits](vert-x3/vertx-web@4.5.14...5.0.8)

Updates `io.vertx:vertx-junit5` from 4.5.14 to 5.0.8
- [Commits](eclipse-vertx/vertx-junit5@4.5.14...5.0.8)

---
updated-dependencies:
- dependency-name: io.vertx:vertx-core
  dependency-version: 5.0.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: io.vertx:vertx-web-client
  dependency-version: 5.0.8
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: io.vertx:vertx-junit5
  dependency-version: 5.0.8
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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