Allow WB/WS packages otherwise groups don't match anything (#1931)

## Summary:

I set up Dependabot updates for WonderBlocks and WonderStuff packages last week and set them so they'd be updated in groups. However, I missed adding them to the `allow` list, which prevented any updates to them. This PR adds them to the `allow` list so that Dependabot actually works. 

Issue: "none"

## Test plan:

Land and watch tonights Dependabot run.

Author: jeremywiebe

Reviewers: jandrade, #perseus

Required Reviewers:

Approved By: jandrade

Checks: ✅ gerald, ✅ Publish npm snapshot (ubuntu-latest, 20.x), ✅ Check builds for changes in size (ubuntu-latest, 20.x), ✅ Lint, Typecheck, Format, and Test (ubuntu-latest, 20.x), ✅ Cypress (ubuntu-latest, 20.x), ✅ Check for .changeset entries for all changed files (ubuntu-latest, 20.x), ✅ Publish Storybook to Chromatic (ubuntu-latest, 20.x), ✅ gerald

Pull Request URL: #1931

.github/dependabot.yml

@@ -10,6 +10,8 @@ updates:
       allow:
           - dependency-name: "@khanacademy/eslint-config"
           - dependency-name: "@khanacademy/eslint-plugin"
+          - dependency-name: "@khanacademy/wonder-blocks-*"
+          - dependency-name: "@khanacademy/wonder-stuff-*"
       assignees:
           - "@Khan/perseus"