fix: add missing dependencies

[bartoszherba]

• add nuxtjs/composition-api

Description

There are some dependencies missing in the packages [core]

• @nuxtjs/composition-api: is used in the core but is not a dependency of the package

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots:

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [ ] I have read the CONTRIBUTING document.

Changelog

• [ ] I have updated the Changelog (V1) v2 and mentioned all breaking changes in the public API.
• [ ] I have documented all new public APIs and made changes to existing docs mentioning the parts I've changed so they're up to date.

Tests

• [ ] I have written test cases for my code
• [ ] I have tested my Pull Request on production build and (to my knowledge) it works without any issues
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

  I tested manually my code, and it works well with both:

• [ ] Default Theme
• [ ] Capybara Theme

Code standards

• [ ] My code follows the code style of this project.
• [ ] I have followed naming conventions

Docs

• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.

[sethidden]

Looks like it's added as a peerDependency - https://github.com/vuestorefront/vue-storefront/pull/6878/files#diff-0b810c38f3c138a3d5e44854edefd5eb966617ca84e62f06511f60acc40546c7L30

[sethidden]

I'll close this due to the PR's age and since it looks like nuxtjs/composition-api is as intended - in the peerDeps. I informed Bartek about closing this