20220831 getData 修正為 get method

routes/api.php

 
 Route::prefix('signup')->group(function () {
     Route::post('/insertData', [SeminarSignUpController::class, 'insertData']);
-    Route::post('/getData', [SeminarSignUpController::class, 'getData']);
+    Route::get('/getData', [SeminarSignUpController::class, 'getData']);
 });