gradle: bump com.zaxxer:HikariCP from 5.1.0 to 6.2.1

Bumps [com.zaxxer:HikariCP](https://github.com/brettwooldridge/HikariCP) from 5.1.0 to 6.2.1.
- [Changelog](https://github.com/brettwooldridge/HikariCP/blob/dev/CHANGES)
- [Commits](brettwooldridge/HikariCP@HikariCP-5.1.0...HikariCP-6.2.1)

---
updated-dependencies:
- dependency-name: com.zaxxer:HikariCP
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

gradle/libs.versions.toml

@@ -12,7 +12,7 @@ microutils = "3.0.5"
 tokenSupport = "3.2.0"
 kotliquery = "1.9.0"
 flywaydb = "10.21.0"
-hikari = "5.1.0"
+hikari = "6.2.1"
 postgresql = "42.7.4"
 digipostSignatureApiClient = "7.0.4"
 jaxbApi = "4.0.2"