Describe the bug

DataFetcherResult<T extends @Nullable Object> and Builder<T extends @Nullable Object> correctly allow nullable T. However, the no-arg factory method still declares <T> without the @Nullable bound:

public static <T> Builder<T> newResult() {
    return new Builder<>();
}

Under @NullMarked, Kotlin 2.1+ infers T : Any, making DataFetcherResult.newResult<MyType?>() a compile error.

This is the same class of issue as #4179 (getDataLoader type bounds, fixed in #4180), but for DataFetcherResult.

To Reproduce

// graphql-java 25.0, Kotlin 2.3+
// Compile error: Type argument is not within its bounds: must be subtype of 'Any'
val result = DataFetcherResult.newResult<String?>()
    .data(null)
    .build()

Expected behavior

The above should compile. Fix:

- public static <T> Builder<T> newResult()
+ public static <T extends @Nullable Object> Builder<T> newResult()

Note: A fix already exists on branch claude/kotlin-jspecify-e2e-test-rdaLf (commit f8f06a25, Mar 8 2026) but has no associated PR.

Versions: graphql-java 25.0, Kotlin 2.3.20