Bump geoip2 from 2.15.0 to 2.16.1 in /Plan (#2161)

Bumps [geoip2](https://github.com/maxmind/GeoIP2-java) from 2.15.0 to 2.16.1.
- [Release notes](https://github.com/maxmind/GeoIP2-java/releases)
- [Changelog](https://github.com/maxmind/GeoIP2-java/blob/v2.16.1/CHANGELOG.md)
- [Commits](https://github.com/maxmind/GeoIP2-java/compare/v2.15.0...v2.16.1)

---
updated-dependencies:
- dependency-name: com.maxmind.geoip2:geoip2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Plan/build.gradle

@@ -81,7 +81,7 @@ subprojects {
         sqliteVersion = "3.36.0.3"
         hikariVersion = "4.0.3"
         slf4jVersion = "1.7.32"
-        geoIpVersion = "2.15.0"
+        geoIpVersion = "2.16.1"
         gsonVersion = "2.8.9"
         bstatsVersion = "2.2.1"
         placeholderapiVersion = "2.10.10"