Fix Nullsafety for Objects in Merge Patch

Adds a @NotNull Annotation to JsonNullable properties which use either an Inline or Ref object which is marked as NotNullable.

SHA: 22762761b003b13b4171fe31a24d80f21e149f44

sync with changes from cjbooms

sync

SHA-1: a994d16a1581db20b52b38f5c71e98c3ff803b84

do not use this one. we rely on the use-delegate branch

latest

• Rebase on upstream

SHA1: f09a45adb04169f76d95c7c62f0eb8b88925e860

Fix security annotations

• Fix security annotations
• Fix tests
• Upgrade gradle

SHA1 bc8de58816846a5694eb9c518ce59cd9b0585f47