chore: Skip elementpath 4.2 but support since 4.1.5.

[Constantin1489]

This allows installing elementpath4.2.1 (bug fix) with skipping 4.2.
Test cases are merged into the elementpath repo. sissaschool/elementpath@4aa9adb

[Constantin1489]

I reverted the fragment=False, It's because the reverted commit code and elementpath4.1.5 caused exception: XPath2Parser.__init__() got an unexpected keyword argument 'fragment'. for this, I will think about the solution.
Internally newer elementpath's fragment=False is default. So even without the argument, old behavior is assured.

[dgtlmoon]

no problems, let me know when its good to merge :)

[Constantin1489]

It's good to merge but I just want to take time.. I want to make some progress related to the i18n thing...

[Constantin1489]

Since the newer PR(#2351) uses fragment=True option, >=4.1.5 won't work. So I closed this.