Use node image for Snyk

[frederikprijck]

Description

Updates the snyk workflow to use the node image instead of php.

Checklist

• [x] I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• [x] All active GitHub checks for tests, formatting, and security are passing
• [x] The correct base branch is being used, if not the default branch

[codecov-commenter]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (279b57e) 100.00% compared to head (59384ba) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #118 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 11 11 Lines 340 340 Branches 99 99 ========================================= Hits 340 340 ```

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