deps: update dependency org.junit.vintage:junit-vintage-engine to v5.9.0 (#924)

[![Mend Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [org.junit.vintage:junit-vintage-engine](https://junit.org/junit5/) ([source](https://togithub.com/junit-team/junit5)) | `5.8.2` -> `5.9.0` | [![age](https://badges.renovateapi.com/packages/maven/org.junit.vintage:junit-vintage-engine/5.9.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/org.junit.vintage:junit-vintage-engine/5.9.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/org.junit.vintage:junit-vintage-engine/5.9.0/compatibility-slim/5.8.2)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/org.junit.vintage:junit-vintage-engine/5.9.0/confidence-slim/5.8.2)](https://docs.renovatebot.com/merge-confidence/) |

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, click this checkbox.

---

This PR has been generated by [Mend Renovate](https://www.mend.io/free-developer-tools/renovate/). View repository job log [here](https://app.renovatebot.com/dashboard#github/googleapis/java-spanner-jdbc).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzMi4xMzUuMSIsInVwZGF0ZWRJblZlciI6IjMyLjEzNS4xIn0=-->

Author: renovate-bot

pom.xml

@@ -357,7 +357,7 @@
         <dependency>
           <groupId>org.junit.vintage</groupId>
           <artifactId>junit-vintage-engine</artifactId>
-          <version>5.8.2</version>
+          <version>5.9.0</version>
           <scope>test</scope>
         </dependency>