fix(deps): update dependency org.checkerframework:checker-qual to v4

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
org.checkerframework:checker-qual (source)	3.55.1 → 4.2.0

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[dtoxvanilla1991]

@copilot Check for any migration required since it is a major -v bump.

[Copilot]

@copilot Check for any migration required since it is a major -v bump.

Checked. No migration changes are required for this bump in this repo.

• kinde-core compiles successfully with checker-qual 4.2.0.
• The only direct usage (org.checkerframework.checker.nullness.qual.Nullable) remains present with the same package/class in both 3.55.1 and 4.2.0.
• Targeted module tests pass when excluding the known live-network test (OidcMetaDataImplTest), which fails independently in sandboxed/offline environments.