Update part5d.md

Update front page test year to 2023

Author: gyeongmin-lee

src/content/5/en/part5d.md

@@ -235,7 +235,7 @@ describe('Note app', function() {
 
   it('front page can be opened', function() {
     cy.contains('Notes')
-    cy.contains('Note app, Department of Computer Science, University of Helsinki 2022')
+    cy.contains('Note app, Department of Computer Science, University of Helsinki 2023')
   })
 
   it('login form can be opened', function() {