Update strategies on R min deps check workflow (#175)

WIP :: parent issue:
insightsengineering/nestdevs-tasks#7

### 🔴 What's needed before merging?

This PR depends on some upstream changes that need to be finalized
before being ready to review.

#### Change in code

- [x] Change branch in verdepcheck-action from `new-strategies` back to
`@main`

#### PRS

- [x] verdepcheck
  * insightsengineering/verdepcheck#24
  * insightsengineering/verdepcheck#26
- [x] verdepcheck-action
  * insightsengineering/r-verdepcheck-action#16

### Changes description

* Documentation update on strategy, replacing `min` with `min_isolate`
and `min_cohort`

.github/workflows/verdepcheck.yaml

@@ -25,7 +25,7 @@ on:
         type: string
       strategy:
         description: |
-          Strategy to test package dependencies. One of: min, release, max.
+          Strategy to test package dependencies. One of: min_isolate, min_cohort, release, max.
         required: true
         type: string
       additional-env-vars: