Upgrade to RF7

[macpijan]

• Possibly resolving limitation mentioned in: capsule-update.robot: Persistence of User Data in Capsule Updates #501 (comment)

[pekkaklarck]

Upgrading at least to RF 6.1 gives you Python 3.12 compatibility. Without it the $var syntax doesn't work:
robotframework/robotframework#4771

Upgrading to RF 7.1 gives official Python 3.13 support, but we didn't actually need to make any code changes to support it so also earlier versions are compatible:
robotframework/robotframework#5091

[macpijan]

@krystian-hebel @SergiiDmytruk CC

[SergiiDmytruk]

I would like $var syntax to work reliably, makes behaviour of RF much more well-defined at least in several places. Switching to TelnetLibrary should be done at the same time, then can claim that it works and drop builtin Telnet library from RF.

[macpijan]

There is a new thread regarding switch to this lib, that it must be updated to telnetlib3, as telnetlib got removed with Python 3.13: https://docs.python.org/3/library/telnetlib.html

[SergiiDmytruk]

Not exactly new, it was mentioned in some relevant issues. exscript module is another option and looks more like telnetlib, because telnetlib3 seems to be asynchronous which wouldn't be used in RF anyway (I assume there is a way to force async functions to be synchronous if needed).

[macpijan]

Thanks for this useful background