Bump org.hdrhistogram:HdrHistogram from 2.1.12 to 2.2.1 in /server

Bumps [org.hdrhistogram:HdrHistogram](https://github.com/HdrHistogram/HdrHistogram) from 2.1.12 to 2.2.1.
- [Release notes](https://github.com/HdrHistogram/HdrHistogram/releases)
- [Commits](HdrHistogram/HdrHistogram@HdrHistogram-2.1.12...HdrHistogram-2.2.1)

---
updated-dependencies:
- dependency-name: org.hdrhistogram:HdrHistogram
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

server/build.gradle

@@ -98,7 +98,7 @@ dependencies {
   // percentiles aggregation
   api 'com.tdunning:t-digest:3.3'
   // precentil ranks aggregation
-  api 'org.hdrhistogram:HdrHistogram:2.1.12'
+  api 'org.hdrhistogram:HdrHistogram:2.2.1'
 
   // lucene spatial
   api "org.locationtech.spatial4j:spatial4j:${versions.spatial4j}", optional