fix: resolve pylint config errors breaking super-linter

## What

Removed the deprecated `suggestion-mode` option from the pylint config and added `too-many-nested-blocks` to the disable list.

## Why

The `suggestion-mode` option was removed in newer versions of pylint, causing an `E0015: Unrecognized option` error that fails the super-linter CI job. The `too-many-nested-blocks` violation in `merge_contributors` is pre-existing and consistent with the other `too-many-*` rules already disabled.

## Notes

- The nested blocks issue in `contributor_stats.py:112` would benefit from a refactor (dict-based merge instead of nested loops) in a follow-up PR
- These errors were hidden until super-linter upgraded its bundled pylint version
- Saw these errors [here](https://github.com/github-community-projects/contributors/actions/runs/22372943481/job/64756293990?pr=394#step:5:488)
- `suggestion-mode` was [removed in 4.0 of pylint](https://pylint.readthedocs.io/en/latest/whatsnew/4/4.0/index.html)

Signed-off-by: Jason Meridth <jmeridth@proton.me>

Author: jmeridth

.github/linters/.python-lint

@@ -99,10 +99,6 @@ recursive=no
 # source root.
 source-roots=
 
-# When enabled, pylint would attempt to guess common misconfiguration and emit
-# user-friendly hints instead of false-positive error messages.
-suggestion-mode=yes
-
 # Allow loading of arbitrary C extensions. Extensions are imported into the
 # active Python interpreter and may run arbitrary code.
 unsafe-load-any-extension=no