chore: bump immutable from 5.1.5 to 5.1.9 - #1070

Changed pages include:

• index.html - view
• 360.html - view
• _template.html - view
• adaptive-streaming.html - view
• all.html - view
• analytics.html - view
• api.html - view
• aspect-ratio-crop.html - view
• audio.html - view
• autoplay-on-scroll.html - view

There are more changes not included in the list