chore(deps): update dependency com.fasterxml.jackson.core:jackson-databind to v2.21.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.fasterxml.jackson.core:jackson-databind (source)	2.18.2 → 2.21.1
com.fasterxml.jackson.core:jackson-databind (source)	2.13.4 → 2.21.1

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Project	Deployment	Actions	Updated (UTC)
boomchainlab-framework	Error		Feb 23, 2026 1:59am

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[sentry]

Bug: The build configuration forces a minor version mismatch between jackson-databind (2.21.1) and other Jackson core libraries (2.13.4), violating compatibility requirements and risking runtime serialization errors.
_{Severity: MEDIUM}

Suggested Fix

Align all Jackson library versions in the build.gradle.kts file. Ensure that jackson-databind, jackson-core, jackson-annotations, and other related Jackson modules all use the same version, for example, by upgrading all of them to the latest compatible version like 2.21.1 or 2.18.2 consistently across all configurations.

Prompt for AI Agent

Review the code at the location below. A potential bug has been identified by an AI
agent.
Verify if this is a real issue. If it is, propose a fix; if not, explain why it's not
valid.

Location: agu-token-java-core/build.gradle.kts#L10-L12

Potential issue: The `build.gradle.kts` file configures mismatched minor versions for
Jackson libraries. During compilation, `jackson-databind` is set to version `2.21.1`
while `jackson-core` and `jackson-annotations` are at `2.13.4`. This violates Jackson's
strict requirement that all core components share the same minor version. This
incompatibility can lead to unpredictable runtime errors, such as `NoSuchMethodError`,
during JSON serialization or deserialization, as different modules expect different
method signatures. The existing custom version check,
`checkJacksonVersionCompatibility()`, is insufficient as it only validates major
versions and a minimum minor version, failing to enforce the required minor version
alignment across all Jackson modules.

_{Did we get this right? 👍 / 👎 to inform future reviews.}