Gantt test broken

[sidharthv96]

Description

In 9.4.2

In 10

demo says line should be invisible, but it's visible.

Steps to reproduce

gantt
    title Hide today marker (vertical line should not be visible)
    dateFormat Z
    axisFormat %d/%m
    todayMarker off
    section Section1
    Today: 1, -01:00, 5min

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Screenshots

No response

Code Sample

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Setup

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Additional Context

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[sidharthv96]

@aloisklink possibly related to dayjs? But not sure why the behaviour is different between v9 & v10

[aloisklink]

I just ran Cypress on commit 06640ab (aka the one right before a5db04b, where we added dayjs), and I'm getting the same diagram, so dayjs didn't change anything.

Cropped from cypress/snapshots/rendering/gantt.spec.js/Gantt-diagram-should-hide-today-marker.snap.png in commit 06640ab:

The only e2e test snapshot that changed in the switch to dayjs for me was the test I mentioned in #4153 (comment), however, the demo line for that test says: "should FAIL..." but it clearly works, so 🤷

By the way, we should probably make something like a develop-v9 branch (if we ever do make any more v9 releases), instead of committing duplicate commits to master/develop. Otherwise it makes the git history a bit confusing :)

The OpenWRT repo is a good example, since they are always committing backports: https://github.com/openwrt/openwrt

[aloisklink]

Hmmmm, apparently the today marker isn't there. Even when I changed todayMarker on, it doesn't seem to appear.

See below for an actual working test:

```mermaid
gantt
    title todayMarker on
    dateFormat YYYY-MM-DD
    axisFormat %d
    todayMarker on
    section Section1
        Today: 2023-03-08, -1h
        The future: 2025-01-01
```

gantt
    title todayMarker on
    dateFormat YYYY-MM-DD
    axisFormat %d
    todayMarker on
    section Section1
        Today: 2023-03-08, -1h
        The future: 2025-01-01

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And the same diagram with todayMarker off:

gantt
    title todayMarker off
    dateFormat YYYY-MM-DD
    axisFormat %d
    todayMarker off
    section Section1
        Today: 2023-03-08, -1h
        The future: 2025-01-01

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