Bump com.h2database:h2 from 2.1.214 to 2.2.220 in /examples/hibernate

Bumps [com.h2database:h2](https://github.com/h2database/h2database) from 2.1.214 to 2.2.220.
- [Release notes](https://github.com/h2database/h2database/releases)
- [Commits](h2database/h2database@version-2.1.214...version-2.2.220)

---
updated-dependencies:
- dependency-name: com.h2database:h2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

examples/hibernate/gradle/libs.versions.toml

@@ -1,6 +1,6 @@
 [versions]
 caffeine = "3.1.6"
-h2 = "2.1.214"
+h2 = "2.2.220"
 hibernate = "6.2.6.Final"
 junit = "5.9.3"
 slf4j = "2.0.7"