Update dependencies to resolve deprecation warnings

[MikeMcC399]

This PR resolves issue #11 "Deprecation warnings in test-app workflow log"

In .github/workflows/test-app.yml it updates:

• actions/checkout@v2 to @v3
• cypress-io/github-action@v2 to @v5

which in itself resolves the deprecation warnings.

In addition, dependencies in package.json are updated to the latest possible versions without causing breaking changes.

In particular:

• Cypress is updated to 9.7.0 which is the latest version before the breaking change to 10.0.0, 11.x and 12.x
• rollup is updated to 2.79.1 which is the latest version before the breaking change of 3.0.0

Verification

1. Fork repository
2. Push to fork
3. View Actions log and ensure that Cypress has run successfully

[MikeMcC399]

See successful run in 3885403987:

       Spec                                              Tests  Passing  Failing  Pending  Skipped  
  ┌────────────────────────────────────────────────────────────────────────────────────────────────┐
  │ ✔  app.spec.js                              00:34       28       28        -        -        - │
  └────────────────────────────────────────────────────────────────────────────────────────────────┘
    ✔  All specs passed!                        00:34       28       28        -        -        -  

[MikeMcC399]

• Closed in favor of Update to cypress 11.2.0 #15