fix tests and other tweaks related to node 20

[lperson]

This PR fixes a couple of failing tests.

Additional context in a slack thread.

Description

ERR_REQUIRE_ESM errors

Pinned strip-ansi to 6.0.1.

Failing actions

• Updated actions/checkout@v3 to actions/checkout@v4 so it doesn't complain about node 20.
• Updated actions/cache@v3 to actions/cache@v4 so it doesn't complain about node 20.

Failure in __test__/backend.test.js

Specify the campaign due date as milliseconds since the epoch when testing with SQLite.

I did a quick smoke test of copying a campaign in the UI when using SQLite and no additional special handling was necessary.

Failure in __test__/extensions/action-handlers/ngpvan-action.test.js

The failing test was testing a failure caused by trying to parse an object as if it were a JSON string.

It’s failing because the exception thrown by a JSON parse error changed between Node versions.

Node 16.18.0

==> node
Welcome to Node.js v16.18.0.
Type ".help" for more information.
> JSON.parse("{")
Uncaught SyntaxError: Unexpected end of JSON input
> JSON.parse({})
Uncaught SyntaxError: Unexpected token o in JSON at position 1

Node 20.11.1

==> nvm use 20.11.1
Now using node v20.11.1 (npm v10.2.4)
==> node
Welcome to Node.js v20.11.1.
Type ".help" for more information.
> JSON.parse({})
Uncaught SyntaxError: "[object Object]" is not valid JSON

Checklist:

• [ ] I have manually tested my changes on desktop and mobile
• [ ] The test suite passes locally with my changes
• [ ] If my change is a UI change, I have attached a screenshot to the description section of this pull request
• [ ] My change is 300 lines of code or less, or has a documented reason in the description why it’s longer
• [ ] I have made any necessary changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] My PR is labeled [WIP] if it is in progress

[lperson]

@mau11 I think it's worth reviewing this and merging it if you approve. It gets the tests a lot further than before.

I'll continue to work on the redis tests failing and make another PR.

[engelhartrueben]

This looks great!