ruff: Enable ruff's RUF027 to check f-string with missing prefix

[seisman]

https://docs.astral.sh/ruff/rules/missing-f-string-syntax/

It helps find the following error:

ruff check --fix --exit-zero pygmt doc/conf.py examples
RUF027 Possible f-string without an `f` prefix
   --> pygmt/alias.py:147:33
    |
145 |                 raise GMTValueError(
146 |                     value,
147 |                     description="value for parameter {name!r}" if name else "value",
    |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
148 |                     choices=mapping.keys(),
149 |                 )
    |
help: Add `f` prefix