(TypeScript) fix strictFunctionTypes violations (pt 1) (#2065)

packages/loot-core/src/server/budget/types/handlers.d.ts

packages/loot-core/src/server/mutators.ts

packages/loot-core/src/server/undo.ts

packages/loot-core/src/shared/async.ts

packages/loot-core/src/types/api-handlers.d.ts

packages/loot-core/src/types/handlers.d.ts

packages/loot-core/src/types/server-handlers.d.ts

tsconfig.json

upcoming-release-notes/2065.md