build: enable refurb rules in ruff

[DimitriPapadopoulos]

No description provided.

[coveralls]

coverage: 99.822%. remained the same
when pulling 5fe1827 on DimitriPapadopoulos:refurb
into d20aa6d on adrienverge:master.

[adrienverge]

I'm not of than of these rules. Sometimes it helps readability to be able to write what refurb dislikes.

[DimitriPapadopoulos]

Agreed. Some of the rules do improve code and performance, other rules may result in less readable code, such as:

if ...:
    return ....
return ....

instead of:

if ...:
    return ....
else:
    return ....