chore(node): upgrade to node v20

[work933k]

Description

This PR proposes to update this package to use a more recent Node version (v20.*). This update required some additional fixes to get tests to succeed.

Motivation and Context

The use of an old Node version (v14.*) makes it hard to provide other improvements for this package.

How Has This Been Tested?

I ran the given test locally.
I also added node v20 as test to CI.

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 not work as expected)
• Documentation (adding or updating documentation)
• Dependency update

Checklist:

• My change requires a change to the documentation and I have updated the documentation accordingly.
• My changes are in sync with the code style of this project.
• There aren't any other open Pull Requests for the same issue/update.
• These changes should be applied to a maintenance branch.
• I have added the Apache 2.0 license header to any new files created.

What is the Impact to Developers Using Jest-Image-Snapshot?

I don't expect developers/users to be negatively be impacted.

[CLAassistant]

All committers have signed the CLA.