TS definition errors since 8.5.0

[julientechdev]

Describe the bug
After updating the lib from 8.4.0 to 8.5.0 (and 8.5.1), we have TS errors on build

To Reproduce
Steps to reproduce the behavior:
Update a project using the lib to 8.5.0 or 8.5.1, with skipLibCheck set to false in tsconfig so that it checks against libs.

Expected behavior
Should build fine like in 8.4.0

Here are the build errors:
` > vue-tsc --noEmit && vite build --emptyOutDir

  ../../node_modules/.pnpm/@vuepic+vue-datepicker@8.5.1_vue@3.4.26/node_modules/@vuepic/vue-datepicker/index.d.ts:372:41 - error TS2371: A parameter initializer is only allowed in a function or constructor implementation.

  372     selectDate?: (day: { value: Date }, isNext: boolean = false) => {};
                                              ~~~~~~~~~~~~~~~~~~~~~~~

  ../../node_modules/.pnpm/@vuepic+vue-datepicker@8.5.1_vue@3.4.26/node_modules/@vuepic/vue-datepicker/index.d.ts:373:68 - error TS2304: Cannot find name 'boolea'.

  373     presetDate?: (value: Date[] | string[] | Date | string, noTz?: boolea) => void;
                                                                         ~~~~~~

  ../../node_modules/.pnpm/@vuepic+vue-datepicker@8.5.1_vue@3.4.26/node_modules/@vuepic/vue-datepicker/index.d.ts:425:51 - error TS2371: A parameter initializer is only allowed in a function or constructor implementation.

  425         handleMonthYearChange?: (isNext: boolean, fromNav = false) => void;
                                                        ~~~~~~~~~~~~~~~

  ../../node_modules/.pnpm/@vuepic+vue-datepicker@8.5.1_vue@3.4.26/node_modules/@vuepic/vue-datepicker/index.d.ts:432:48 - error TS2371: A parameter initializer is only allowed in a function or constructor implementation.

  432         updateTime: (value: number | number[], isHours = true, isSeconds = false) => void;
                                                     ~~~~~~~~~~~~~~

  ../../node_modules/.pnpm/@vuepic+vue-datepicker@8.5.1_vue@3.4.26/node_modules/@vuepic/vue-datepicker/index.d.ts:432:64 - error TS2371: A parameter initializer is only allowed in a function or constructor implementation.

  432         updateTime: (value: number | number[], isHours = true, isSeconds = false) => void;
                                                                     ~~~~~~~~~~~~~~~~~


  Found 5 errors in the same file, starting at: ../../node_modules/.pnpm/@vuepic+vue-datepicker@8.5.1_vue@3.4.26/node_modules/@vuepic/vue-datepicker/index.d.ts:372`

Environment:
macOS 14.4.1
node 20.12.2
pnpm 8.15.8
typescript 5.4.5