How did I fix «Unknown collation: 'utf8mb4_0900_ai_ci'» on importing a `*.sql` dump to MySQL?

MySQL
1

2023-12-04--05-38-45

2 
sed -i 's/utf8mb4_0900_ai_ci/utf8_unicode_ci/g' <file>.sql
sed -i 's/utf8mb4/utf8/g'  <file>.sql

stackoverflow.com/a/31506831