docs: update REPL demo GIF with modern JS features

[Saksham1o]

Description

The existing latestDemo.gif was outdated. This PR replaces it with a new recording that demonstrates modern JavaScript capabilities now supported by the Boa engine, including:

• Variable declarations (let/const)
• Arrow functions
• Function execution and expressions

The recording was made using the latest build to ensure the output reflects the current state of the project.

Changes

• Updated docs/img/latestDemo.gif

Fixes #2703

[github-actions]

Test262 conformance changes

Test result	main count	PR count	difference
Total	52,963	52,963	0
Passed	49,713	49,713	0
Ignored	2,262	2,262	0
Failed	988	988	0
Panics	0	0	0
Conformance	93.86%	93.86%	0.00%

Tested main commit: 4b12d2aacb4a3f3a1038334505f736a06c8a22ac
Tested PR commit: c8938f17992f2b1e248e999c67f6f23c5b823d94
Compare commits: 4b12d2a...c8938f1

[nekevss]

The size on the GIF should ideally be a bit higher.

Also, with the differing approach. I would recommend looking into something like charmbracelet's VHS

[Saksham1o]

Thanks for the feedback @nekevss I've re-recorded the demo using VHS with a higher resolution (1400 x 700) and updated the GIF to include modern JS features like arrow functions and array methods. Please take another look!

[nekevss]

Hi! Thanks for looking into this. Could you include the .tape file for the GIF

[Saksham1o]

Hi, I've also added the demo.tape file used to generate the GIF using VHS. This way the recording can be easily reproduced and updated in the future.

Please let me know if any changes are needed!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.86%. Comparing base (6ddc2b4) to head (c8938f1).
⚠️ Report is 874 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #4835       +/-   ##
===========================================
+ Coverage   47.24%   57.86%   +10.62%     
===========================================
  Files         476      557       +81     
  Lines       46892    61036    +14144     
===========================================
+ Hits        22154    35321    +13167     
- Misses      24738    25715      +977     

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[Saksham1o]

Hi! @nekevss I've added the requested .tape file used to generate the GIF and updated the branch with the latest main.
Could you please take another look when you have time?

Thanks!