Update vanilla-calendar-pro to v3.2.0 in dropdowns example - #42842

Changed pages include:

• index.html - view
• 404.html - view
• about/index.html - view
• components/index.html - view
• docs/index.html - view
• docsref/index.html - view
• examples/index.html - view
• getting-started/index.html - view
• migration/index.html - view
• docs/5.3/index.html - view

There are more changes not included in the list