Add `PUT` endpoint for updating experience

[ArshiaZr]

Resolves #8 Description:

• Added PUT /resume/experience/{id}:
  • Validates required fields (title, company, start_date, end_date, description).
  • Optionally handles logo file.
  • Returns 400 for missing/invalid fields.
  • On success, returns a message and updated record ID.

Tests:

• Added test_update_experience to verify:
  • Invalid experience IDs return 400.
  • Successful update of experience returns 200.

[ArshiaZr]

@Pradyuman7

[ArshiaZr]

One test fails which is another part of the code that has been written by someone else I can also resolve it @Pradyuman7

[ArshiaZr]

Fixed them @Pradyuman7

[ArshiaZr]

@Pradyuman7 conflicts resolved