VirtualScroller scrolling is jarring when itemSize is changed

[bgoscinski]

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[x] bug report => Search github for a similar issue or PR before submitting
[ ] feature request => Please check if request is not on the roadmap already https://github.com/primefaces/primevue/wiki/Roadmap
[ ] support request => Please do not submit support request here, instead see http://forum.primefaces.org/viewforum.php?f=110

CodeSandbox Case (Bug Reports)
https://codesandbox.io/s/zen-shamir-5o79w3?file=/src/VirtualScrollerDemo.vue

Current behavior
After a change to itemSize scrolling is jarring.

Expected behavior
After a change to itemSize scrolling is smooth.

Minimal reproduction of the problem with instructions

1. Create any VirtualScroller, let it initialize
2. Scroll it, observe scrolling is smooth and scrollbar doesn't jump (good)
3. After VirtualScroller initializes change itemSize binding to different value
4. Scroll it, observe scrolling is jarring - scrollbar jumps back (bad)

What is the motivation / use case for changing the behavior?
Good UX

Please tell us about your environment:
Windows 10, latest Chrome and Brave

• Vue version: 3.2.31
• PrimeVue version: 3.12.0
• Browser: reproduced on Chrome and Brave, didn't check others

[bgoscinski]

The bug is still reproducible on PrimeVue 3.15.0

[github-actions]

Due to PrimeTek's demanding roadmap for PrimeVue and the limited bandwidth of the core team, this issue is available for anyone to work on. Make sure to reference this issue in your pull request. ✨ Thank you for your contribution! ✨