Postgres 9.x doesn't have arm support. Upgrade lectures to arm-supported postgres images.

[BretFisher]

postgres upgrade example not supported on arm for 9.x.

Docker Mastery:

• [x] Add lecture written note on version changes to support arm (15.1 to 15.2)
• [ ] Lecture: Assignment: Database Upgrades with Named Volumes
• [ ] Lecture: Assignment Answers

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