[UPDATED]updated curd operation in semester model

fixes #282 
updated curd operation in semester.js in models folder

Author: deepti-50

models/semester.js

@@ -1,6 +1,6 @@
 import connector from "#models/databaseUtil";
 const semesterSchema = {
-  number:{Number,enum: [1,2,3,4,5,6,7,8], required:true},
+  number:{ type: Number,enum: [1,2,3,4,5,6,7,8], required:true},
   academicYear: {
     type: String,
     required: true,