exercises asking for `text`: Remind students to submit package.yaml

For these exercises:

```
$ git grep 'text.*to your list of dependencies'
exercises/practice/acronym/.docs/instructions.append.md:- Add `- text` to your list of dependencies in package.yaml.
exercises/practice/atbash-cipher/.docs/instructions.append.md:- add `- text` to your list of dependencies in package.yaml.
exercises/practice/bob/.docs/instructions.append.md:- Add `- text` to your list of dependencies in package.yaml.
exercises/practice/diamond/.docs/instructions.append.md:- Add `- text` to your list of dependencies in package.yaml.
exercises/practice/etl/.docs/instructions.append.md:- Add `- text` to your list of dependencies in package.yaml.
exercises/practice/isogram/.docs/instructions.append.md:- Add `- text` to your list of dependencies in package.yaml.
exercises/practice/pig-latin/.docs/instructions.append.md:- Add `- text` to your list of dependencies in package.yaml.
exercises/practice/raindrops/.docs/instructions.append.md:- Add `- text` to your list of dependencies in package.yaml.
exercises/practice/resistor-color-trio/.docs/instructions.append.md:- Add `- text` to your list of dependencies in package.yaml.
exercises/practice/rotational-cipher/.docs/instructions.append.md:- add `- text` to your list of dependencies in package.yaml.
exercises/practice/twelve-days/.docs/instructions.append.md:- add `- text` to your list of dependencies in package.yaml.
```

Please add another line to those instructions reminding students that they will need to submit `package.yaml` for the tests to run properly.