bc5d771a06
This commit updates the whole Spring Framework codebase to use JSpecify annotations instead of Spring null-safety annotations with JSR 305 semantics. JSpecify provides signficant enhancements such as properly defined specifications, a canonical dependency with no split-package issue, better tooling, better Kotlin integration and the capability to specify generic type, array and varargs element null-safety. Generic type null-safety is not defined by this commit yet and will be specified later. A key difference is that Spring null-safety annotations, following JSR 305 semantics, apply to fields, parameters and return values, while JSpecify annotations apply to type usages. That's why this commit moves nullability annotations closer to the type for fields and return values. See gh-28797
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