fix: types of isOptionableExpression

[baseballyama]

I run yarn build on the latest main branch, but command failed due to type error.
Therefore I fixed it up.

baseballyama@baseballyama eslint-plugin-svelte % yarn build
yarn run v1.22.19
$ yarn clean
$ rimraf .nyc_output lib coverage build .svelte-kit svelte.config-dist.js
$ yarn build:ts
$ tsc --project ./tsconfig.build.json
src/rules/@typescript-eslint/no-unnecessary-condition.ts:749:34 - error TS2345: Argument of type 'ArrayExpression | ArrayPattern | ArrowFunctionExpression | AssignmentExpression | AwaitExpression | ... 35 more ... | YieldExpression' is not assignable to parameter of type 'LeftHandSideExpression'.
  Type 'AssignmentExpression' is not assignable to type 'LeftHandSideExpression'.
    Type 'AssignmentExpression' is missing the following properties from type 'TSTypeAssertion': typeAnnotation, expression

749       if (isOptionableExpression(nodeToCheck)) {
                                     ~~~~~~~~~~~


Found 1 error in src/rules/@typescript-eslint/no-unnecessary-condition.ts:749

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[ota-meshi]

Thank you!