Consolidate null-provider bookkeeping and drop redundant deserialize() overrides in SettableAnyProperty

[java-dependency-upgrade-fixer]

Summary

Bounded cleanup pass over the single production file already changed by the mirrored PR (Apply default null handling to @JsonAnySetter), scoped strictly inside SettableAnyProperty.java.

Changes

1. Consolidate: The ternary (_valueDeserializer == _nullProvider) ? deser : _nullProvider (deciding whether to keep tracking the value deserializer as the null provider, or preserve an explicitly-configured null provider) was duplicated identically across MethodAnyProperty, MapFieldAnyProperty, JsonNodeFieldAnyProperty, and MapParameterAnyProperty's withValueDeserializer() overrides. Extracted into one protected helper _nullProviderFor(ValueDeserializer<Object>) on the base class.
2. Delete redundant overrides: JsonNodeFieldAnyProperty.deserialize() and JsonNodeParameterAnyProperty.deserialize() duplicated the base class's deserialize() logic. Both subclasses always construct with a null TypeDeserializer, so once the PR added the null-provider check to the base method, the base method's behavior for these subclasses is provably identical to the override body (confirmed via bytecode inspection that JsonParser.hasToken(t) is exactly currentToken() == t). Removed the now-dead-weight overrides.

Behavior preservation

• Net change is -15 lines in one file; no API, null-handling, ordering, or error-message change.
• Same focused behavior command (72 tests spanning the PR's own new tests plus pre-existing any-setter/buffer/object-id tests that exercise SettableAnyProperty/PropertyValueBuffer) passes identically before and after.
• Full ./mvnw clean verify passes: 6188 tests, 0 failures, 0 errors, 1 pre-existing unrelated skip.

Limitations

• No performance claim is made; this is a structural/duplication cleanup, not a measured optimization.
• No build/dependency/JDK modernization was in scope since the original PR touched no build or version files.
• This mirror does not merge; per the mirror's own description, any validated companion improvement would be offered to the original contributor branch first.

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