Bump jacksonVersion from 2.15.4 to 2.21.3

Bumps `jacksonVersion` from 2.15.4 to 2.21.3.

Updates `com.fasterxml.jackson:jackson-bom` from 2.15.4 to 2.21.3
- [Commits](FasterXML/jackson-bom@jackson-bom-2.15.4...jackson-bom-2.21.3)

Updates `com.fasterxml.jackson.dataformat:jackson-dataformat-toml` from 2.15.4 to 2.21.3
- [Commits](FasterXML/jackson-dataformats-text@jackson-dataformats-text-2.15.4...jackson-dataformats-text-2.21.3)

---
updated-dependencies:
- dependency-name: com.fasterxml.jackson.dataformat:jackson-dataformat-toml
  dependency-version: 2.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: com.fasterxml.jackson:jackson-bom
  dependency-version: 2.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

build.gradle

@@ -22,7 +22,7 @@ allprojects {
 ext {
     // Platforms
     grpcVersion = '1.76.0' // [1.38.0,) Needed for io.grpc.protobuf.services.HealthStatusManager
-    jacksonVersion = '2.15.4' // [2.9.0,)
+    jacksonVersion = '2.21.3' // [2.9.0,)
     jackson3Version = '3.0.4'
     nexusVersion = '0.5.0-alpha'
     // we don't upgrade to 1.10.x because it requires kotlin 1.6. Users may use 1.10.x in their environments though.