Bump com.fasterxml.jackson:jackson-bom in /samples/java

Bumps [com.fasterxml.jackson:jackson-bom](https://github.com/FasterXML/jackson-bom) from 2.19.2 to 2.20.0.
- [Commits](FasterXML/jackson-bom@jackson-bom-2.19.2...jackson-bom-2.20.0)

---
updated-dependencies:
- 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] <[email protected]>

Author: dependabot[bot]

samples/java/build.gradle.kts

@@ -11,8 +11,8 @@ dependencies {
     implementation(platform("com.squareup.okhttp3:okhttp-bom:5.1.0"))
     implementation("com.squareup.okhttp3:okhttp")
     implementation("com.squareup.okhttp3:okhttp-sse")
-    implementation(platform("com.fasterxml.jackson:jackson-bom:2.19.2"))
-    implementation("com.fasterxml.jackson.core:jackson-databind:2.19.2")
+    implementation(platform("com.fasterxml.jackson:jackson-bom:2.20.0"))
+    implementation("com.fasterxml.jackson.core:jackson-databind:2.20.0")
     implementation("com.google.guava:guava:33.4.8-jre")
 }