perf: Do not read worksheet twice

scrape/parse/v1_v2.ts

@@ -12,7 +12,7 @@
  * GNU General Public License for more details.
  */
 
-import ExcelJS, { Worksheet } from "exceljs"
+import { Workbook, Worksheet } from "exceljs"
 import fs from "fs"
 import parseAbsence, { AbsenceResult } from "../utils/parseAbsence.js"
 import parseTeachers from "../utils/parseTeachers.js"
@@ -27,9 +27,7 @@ interface ScheduleDay {
   ABSENCE?: AbsenceResult[];
 }
 
-export default async function parseV1V2(downloadedFilePath: string) {
-  const workbook = new ExcelJS.Workbook();
-  await workbook.xlsx.readFile(downloadedFilePath);
+export default async function parseV1V2(workbook: Workbook) {
   const teacherMap = await parseTeachers();
 
   const dateRegex = /^(pondělí|úterý|středa|čtvrtek|pátek|po|út|ut|st|čt|ct|pa|pá)\s+(\d{1,2})\.\s*(\d{1,2})\.\s*(\d{4}|\d{2})/i;