Update pylint to 1.8.3

Summary:

• Fix false positive `inconsistent-return-statements` message when a function is defined under an if statement.
• Exempt __doc__ from triggering a redefined-builtin __doc__ can be used to specify a docstring for a module without passing it as a first-statement string.
• Don't crash on invalid strings when checking for logging-format-interpolation
• Fix false positive `inconsistent-return-statements` message by avoiding useless exception inference if the exception is not handled.
• Fix false positive undefined-variable for lambda argument in class definitions
• Fix false-positive `undefined-variable` for generated comprehension variables in function default arguments

Signed-off-by: Pierre-Yves <pyu@riseup.net>

Test Plan:

• Enable unit tests
• Build spyder against this version

Reviewers: Triage Team, sunnyflunk

Reviewed By: Triage Team, sunnyflunk

Differential Revision: https://dev.solus-project.com/D2572