test: prettier version bump into 3.6

[cagataysayg]

Prettier 3.6 has some rule changes, updated the test flow to match the version.

https://prettier.io/blog/2025/06/23/3.6.0#other-changes

Note: Needs approval for running tests on Github actions.

[cagataysayg]

@hosseinmd Could you run the workflow to verify if the tests are passing.

[fardad-dev]

could you fix it to support both versions [3.0,3.6]
i think we could remove failed part of test because it's not related to this plugin.

[cagataysayg]

I've re-added prettier 3.0 and removed prism-core.js and related test files.

Question: Should I also remove prism-dependencies.js?

[fardad-dev]

I mean remove lines of code in prism-core.js which failed

[cagataysayg]

Removed the _self definition part only, which was throwing the error.

[fardad-dev]

Thank you