Update dependency com.fasterxml.jackson:jackson-bom to v2.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
com.fasterxml.jackson:jackson-bom	2.20.1 → 2.21.0

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Configuration

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[testlens-app]

✅ All tests passed ✅

⚠️ TestLens detected flakiness ⚠️

Test Summary

Check	Task	Test	Runs
Build Plugin / gradle-build	:testSamples	SamplesTest > use-all-java-module-plugins_build.sample	❌ ✅
Build Plugin / gradle-build	:testSamples	SamplesTest > use-only-java-module-testing-plugin_build.sample	❌ ✅
Build Plugin / gradle-build	:testSamples	SamplesTest > use-with-test-fixtures_build.sample	❌ ✅

🏷️ Commit: 3d26fbc
▶️ Tests: 6 executed
⚪️ Checks: 2/2 completed

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